{"id":178,"date":"2026-02-13T09:26:51","date_gmt":"2026-02-13T08:26:51","guid":{"rendered":"https:\/\/helloblog.io\/cs\/smtp-porty-v-roce-2026-proc-ti-e-maily-z-webu-mizi-a-jak-zvolit-spravny-port-587-vs-465\/"},"modified":"2026-02-13T09:26:51","modified_gmt":"2026-02-13T08:26:51","slug":"smtp-porty-v-roce-2026-proc-ti-e-maily-z-webu-mizi-a-jak-zvolit-spravny-port-587-vs-465","status":"publish","type":"post","link":"https:\/\/helloblog.io\/cs\/smtp-porty-v-roce-2026-proc-ti-e-maily-z-webu-mizi-a-jak-zvolit-spravny-port-587-vs-465\/","title":{"rendered":"SMTP porty v roce 2026: pro\u010d ti e-maily z webu miz\u00ed a jak zvolit spr\u00e1vn\u00fd port (587 vs 465)"},"content":{"rendered":"\n<p>Kdy\u017e provozuje\u0161 web, bere\u0161 jako samoz\u0159ejmost, \u017ee e-maily prost\u011b doraz\u00ed: odpov\u011b\u010f z kontaktn\u00edho formul\u00e1\u0159e, potvrzen\u00ed objedn\u00e1vky, reset hesla, registrace u\u017eivatele. Jakmile tyhle zpr\u00e1vy za\u010dnou \u201emizet\u201c, nen\u00ed to jen drobn\u00e1 nep\u0159\u00edjemnost. Je to ztr\u00e1ta lead\u016f, z\u00e1kazn\u00edk\u016f a hlavn\u011b d\u016fv\u011bry \u2013 proto\u017ee web p\u0159est\u00e1v\u00e1 spolehliv\u011b komunikovat.<\/p>\n\n\n\n<p>U WordPressu (a obecn\u011b u web\u016f na sd\u00edlen\u00fdch hostinz\u00edch) je tich\u00fdm vin\u00edkem skoro v\u017edy v\u00fdchoz\u00ed odes\u00edl\u00e1n\u00ed po\u0161ty. Pro modern\u00ed poskytovatele schr\u00e1nek typu Gmail nebo Outlook vypad\u00e1 takov\u00e9 odes\u00edl\u00e1n\u00ed podez\u0159ele podobn\u011b jako spam. \u0158e\u0161en\u00ed je p\u0159epnout odes\u00edl\u00e1n\u00ed na profesion\u00e1ln\u00ed, autentizovan\u00fd kan\u00e1l p\u0159es SMTP (Simple Mail Transfer Protocol). A tady nar\u00e1\u017e\u00ed\u0161 na zd\u00e1nliv\u011b jednoduchou ot\u00e1zku, kter\u00e1 m\u00e1 v praxi z\u00e1sadn\u00ed dopad: jak\u00fd SMTP port v roce 2026 pou\u017e\u00edt?<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1340\" src=\"https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1.jpeg\" alt=\"Ilustra\u010dn\u00ed obr\u00e1zek k t\u00e9matu e-mailov\u00e9 doru\u010ditelnosti a SMTP nastaven\u00ed\" class=\"wp-image-177\" srcset=\"https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1.jpeg 2560w, https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1-300x157.jpeg 300w, https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1-1024x536.jpeg 1024w, https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1-768x402.jpeg 768w, https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1-1536x804.jpeg 1536w, https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1-2048x1072.jpeg 2048w, https:\/\/helloblog.io\/app\/uploads\/sites\/11\/2026\/02\/imgi_3_imgi_3_05.08.21_The-Complete-Guide-to-Becoming-a-Web-Designer_2_1200_628_2-scaled-1-400x209.jpeg 400w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\">\/ \u2014 <em>Forr\u00e1s: Elementor.com<\/em><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Rychl\u00e9 shrnut\u00ed (co si odn\u00e9st hned)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Nejrychlej\u0161\u00ed odpov\u011b\u010f: pou\u017e\u00edvej port <strong>587<\/strong> se \u0161ifrov\u00e1n\u00edm <strong>STARTTLS<\/strong>. Je to modern\u00ed standard pro odes\u00edl\u00e1n\u00ed (submission) z webu nebo po\u0161tovn\u00edho klienta.<\/li>\n\n\n<li>Dobr\u00e1 alternativa: port <strong>465<\/strong> se <strong>SMTPS<\/strong> (implicitn\u00ed SSL\/TLS). Je taky b\u011b\u017en\u00fd a bezpe\u010dn\u00fd \u2013 n\u011bkter\u00fdm provider\u016fm vyhovuje v\u00edc. Pokud 587 nefunguje, zkus 465.<\/li>\n\n\n<li>Port, kter\u00e9mu se vyhni: <strong>port 25<\/strong> nepou\u017e\u00edvej pro odes\u00edl\u00e1n\u00ed z webu (email submission). Je ne\u0161ifrovan\u00fd, historicky ur\u010den\u00fd hlavn\u011b pro komunikaci server\u2013server (relay) a \u010dasto je blokovan\u00fd ISP i hostingy kv\u016fli spamu.<\/li>\n\n\n<li>Skute\u010dn\u00fd probl\u00e9m (\u201epro\u010d\u201c): v\u00fdchoz\u00ed odes\u00edl\u00e1n\u00ed z webu (nap\u0159. <code>wp_mail()<\/code> ve WordPressu) je typicky <strong>bez autentizace<\/strong> a jde z webserveru bez vybudovan\u00e9 e-mailov\u00e9 reputace, co\u017e spam filtry nemaj\u00ed r\u00e1dy.<\/li>\n\n\n<li>Skute\u010dn\u00e9 \u0159e\u0161en\u00ed (\u201ejak\u201c): pos\u00edlej transak\u010dn\u00ed e-maily p\u0159es <strong>dedikovanou SMTP slu\u017ebu<\/strong> (nap\u0159. SendGrid, Brevo, Mailgun). Po\u0161ta jde p\u0159es d\u016fv\u011bryhodn\u00fd, autentizovan\u00fd server.<\/li>\n\n\n<li>\u201eEasy button\u201c pro WordPress: nejjednodu\u0161\u0161\u00ed je pou\u017e\u00edt plugin, kter\u00fd to vy\u0159e\u0161\u00ed za tebe. P\u0159\u00edklad je <a href=\"https:\/\/elementor.com\/products\/site-mailer\">Site Mailer by Elementor<\/a> \u2013 plugin bez konfigurace port\u016f a API kl\u00ed\u010d\u016f, kter\u00fd p\u0159esm\u011bruje transak\u010dn\u00ed e-maily p\u0159es slu\u017ebu s vysokou doru\u010ditelnost\u00ed.<\/li>\n\n\n<li>Transak\u010dn\u00ed vs. marketing: SMTP \u0159e\u0161en\u00ed pou\u017e\u00edvej pro <strong>transak\u010dn\u00ed e-maily<\/strong> (formul\u00e1\u0159e, hesla, \u00fa\u010dtenky). Newslettery a hromadn\u00e9 kampan\u011b pos\u00edlej p\u0159es samostatnou <strong>email marketing platformu (ESP)<\/strong>, abys neni\u010dil reputaci odes\u00edl\u00e1n\u00ed.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Co je SMTP a pro\u010d to web v\u016fbec \u0159e\u0161\u00ed<\/h2>\n\n\n\n<p>SMTP (Simple Mail Transfer Protocol) si p\u0159edstav jako \u201epo\u0161tovn\u00ed \u00fa\u0159ad internetu\u201c \u2013 univerz\u00e1ln\u00ed pravidla, podle kter\u00fdch si po\u0161tovn\u00ed klienti a po\u0161tovn\u00ed servery p\u0159ed\u00e1vaj\u00ed zpr\u00e1vy. Kdy\u017e ode\u0161le\u0161 e-mail, typicky to nelet\u00ed rovnou p\u0159\u00edjemci:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>Tv\u016fj web\/klient ode\u0161le zpr\u00e1vu na <strong>odchoz\u00ed po\u0161tovn\u00ed server<\/strong> (nap\u0159. <code>smtp.gmail.com<\/code>). To je f\u00e1ze <em>submission<\/em> (pod\u00e1n\u00ed).<\/li>\n\n\n<li>Odchoz\u00ed server vyhled\u00e1 server p\u0159\u00edjemce a zpr\u00e1vu mu p\u0159ed\u00e1. To je f\u00e1ze <em>relay<\/em> (p\u0159epos\u00edl\u00e1n\u00ed).<\/li>\n\n\n<li>Server p\u0159\u00edjemce zpr\u00e1vu ulo\u017e\u00ed, dokud si ji u\u017eivatel nevyzvedne ve schr\u00e1nce.<\/li>\n\n<\/ol>\n\n\n\n<p>\u201eSMTP port\u201c je konkr\u00e9tn\u00ed \u010d\u00edslovan\u00fd \u201evchod\u201c na serveru ur\u010den\u00fd pro tento \u00fa\u010del. Stejn\u00fd server m\u016f\u017ee obsluhovat r\u016fzn\u00e9 sc\u00e9n\u00e1\u0159e (submission vs. relay) a ka\u017ed\u00fd historicky pou\u017e\u00edval jin\u00e9 porty.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Probl\u00e9m WordPressu: <code>wp_mail()<\/code><\/h3>\n\n\n\n<p>WordPress ve v\u00fdchoz\u00edm stavu SMTP nepou\u017e\u00edv\u00e1. Spol\u00e9h\u00e1 na PHP funkci <code>wp_mail()<\/code>, kter\u00e1 se pokus\u00ed odeslat e-mail p\u0159\u00edmo z webserveru. Z pohledu doru\u010ditelnosti je to pr\u016f\u0161vih hned z n\u011bkolika d\u016fvod\u016f:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>Webserver nen\u00ed po\u0161tovn\u00ed server: je vylad\u011bn\u00fd na obsluhu HTTP, ne na doru\u010dov\u00e1n\u00ed e-mail\u016f. Obvykle mu chyb\u00ed spr\u00e1vn\u00e9 po\u0161tovn\u00ed nastaven\u00ed a best practices.<\/li>\n\n\n<li>Chyb\u00ed autentizace: server jen \u201etvrd\u00ed\u201c, \u017ee odes\u00edl\u00e1 jako <code>tvoje-domena.cz<\/code>, ale nem\u00e1 k tomu prokazateln\u00e9 opr\u00e1vn\u011bn\u00ed.<\/li>\n\n\n<li>Nulov\u00e1 reputace: Gmail\/Microsoft si dr\u017e\u00ed reputa\u010dn\u00ed sk\u00f3re zn\u00e1m\u00fdch odes\u00edlac\u00edch server\u016f. Webserver bez historie je \u201enezn\u00e1m\u00fd odes\u00edlatel\u201c, co\u017e je pro filtry podez\u0159el\u00e9.<\/li>\n\n\n<li>Sd\u00edlen\u00e1 IP a \u201e\u0161patn\u00e9 sousedstv\u00ed\u201c: na shared hostingu sd\u00edl\u00ed\u0161 IP s dal\u0161\u00edmi weby. Kdy\u017e n\u011bkdo spamuje, blacklist m\u016f\u017ee potopit i tv\u00e9 legitimn\u00ed e-maily.<\/li>\n\n<\/ol>\n\n\n\n<p>V\u00fdsledek: neautentizovan\u00e1 po\u0161ta z webserveru kon\u010d\u00ed ve spamu, nebo se rovnou zahod\u00ed \u2013 klidn\u011b bez toho, aby ses o tom dozv\u011bd\u011bl. Spr\u00e1vn\u00e1 cesta je p\u0159esm\u011brovat odes\u00edl\u00e1n\u00ed p\u0159es profesion\u00e1ln\u00ed SMTP provider (nebo API), a t\u00edm dostat po\u0161tu na d\u016fv\u011bryhodnou infrastrukturu. A do toho vstupuje volba portu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kr\u00e1tk\u00e1 historie SMTP port\u016f (a pro\u010d jsou n\u011bkter\u00e9 dnes slep\u00e9 uli\u010dky)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Port 25: origin\u00e1l z roku 1982 a d\u00e1lnice pro spam<\/h3>\n\n\n\n<p>Na za\u010d\u00e1tku existoval jen port <strong>25<\/strong>. Byl navr\u017een pro p\u0159ed\u00e1v\u00e1n\u00ed po\u0161ty mezi po\u0161tovn\u00edmi servery (Mail Transfer Agents, MTA) \u2013 tedy pro <em>relay<\/em>. Byl otev\u0159en\u00fd, bez autentizace a bez \u0161ifrov\u00e1n\u00ed. V akademick\u00e9m prost\u0159ed\u00ed to tehdy d\u00e1valo smysl.<\/p>\n\n\n\n<p>Pak p\u0159i\u0161li spame\u0159i: port 25 \u0161el snadno zneu\u017e\u00edt k masov\u00e9mu odes\u00edl\u00e1n\u00ed \u2013 napoj\u00ed\u0161 se na ciz\u00ed server, p\u0159ed\u00e1\u0161 mu hromadu zpr\u00e1v a nech\u00e1\u0161 ho to rozes\u00edlat. Ne\u0161ifrovan\u00fd a neautentizovan\u00fd kan\u00e1l se stal ide\u00e1ln\u00ed pro zneu\u017eit\u00ed.<\/p>\n\n\n\n<p>Dnes je kv\u016fli t\u00e9to historii <strong>odchoz\u00ed port 25 \u010dasto blokovan\u00fd<\/strong> t\u00e9m\u011b\u0159 v\u0161ude: u ISP, v reziden\u010dn\u00edch s\u00edt\u00edch i u cloud provider\u016f a hosting\u016f. Je to jeden z hlavn\u00edch zp\u016fsob\u016f, jak brzdit botnety a kompromitovan\u00e9 servery v rozes\u00edl\u00e1n\u00ed spamu.<\/p>\n\n\n\n<div class=\"wp-block-group callout callout-warning is-style-warning is-layout-flow wp-block-group-is-layout-flow\" style=\"border-width:1px;border-radius:8px;padding-top:1rem;padding-right:1.5rem;padding-bottom:1rem;padding-left:1.5rem\">\n\n<h4 class=\"wp-block-heading callout-title\">Praktick\u00fd d\u016fsledek<\/h4>\n\n\n<p>Port <strong>25<\/strong> nepou\u017e\u00edvej pro odes\u00edl\u00e1n\u00ed e-mail\u016f z webu (<em>submission<\/em>). I kdyby ti to hosting dovolil, zbytek internetu to \u010dasto zablokuje a doru\u010ditelnost bude katastrof\u00e1ln\u00ed.<\/p>\n\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Port 465: SMTPS (implicitn\u00ed SSL\/TLS) a n\u00e1vrat z \u201edeprecace\u201c<\/h3>\n\n\n\n<p>Koncem 90. let za\u010dala b\u00fdt nutnost \u0161ifrov\u00e1n\u00ed jasn\u00e1. Vznikl port <strong>465<\/strong>, kter\u00fd zavedl <strong>SMTPS<\/strong> (\u201eSMTP over SSL\u201c). Princip: klient se p\u0159ipoj\u00ed a okam\u017eit\u011b prob\u011bhne SSL\/TLS handshake \u2013 cel\u00e9 spojen\u00ed je od prvn\u00edho okam\u017eiku v \u0161ifrovan\u00e9m tunelu. Tomu se \u0159\u00edk\u00e1 <strong>Implicit SSL\/TLS<\/strong>.<\/p>\n\n\n\n<p>Historicky to nebyl na \u010das \u201eofici\u00e1ln\u00ed\u201c standard IETF (organizace pro internetov\u00e9 standardy) a port byl chv\u00edli veden jako deprecated ve prosp\u011bch STARTTLS. V praxi ale 465 nikdy nezmizel \u2013 naopak ud\u011blal comeback.<\/p>\n\n\n\n<p>Dnes je port <strong>465<\/strong> b\u011b\u017en\u00fd, akceptovan\u00fd a velmi popul\u00e1rn\u00ed. \u0158ada velk\u00fdch provider\u016f (v\u010detn\u011b Gmailu) ho st\u00e1le doporu\u010duje. Pro web je to bezpe\u010dn\u00e1 a legitimn\u00ed volba.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Port 587: modern\u00ed standard pro submission a STARTTLS<\/h3>\n\n\n\n<p>Aby se vy\u0159e\u0161ila standardizace, IETF ur\u010dilo port <strong>587<\/strong> jako ofici\u00e1ln\u00ed port pro <em>email submission<\/em> (tedy situace, kdy web nebo klient odes\u00edl\u00e1 po\u0161tu na server).<\/p>\n\n\n\n<p>Port 587 typicky pou\u017e\u00edv\u00e1 <strong>STARTTLS<\/strong> (tzv. <strong>Explicit TLS<\/strong>). Prakticky to funguje takto:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>Web se p\u0159ipoj\u00ed k mail serveru na portu 587 (na za\u010d\u00e1tku textov\u011b).<\/li>\n\n\n<li>Po\u0161le p\u0159\u00edkaz <code>EHLO<\/code> (p\u0159edstaven\u00ed).<\/li>\n\n\n<li>Server odpov\u00ed seznamem schopnost\u00ed v\u010detn\u011b <code>STARTTLS<\/code>.<\/li>\n\n\n<li>Klient po\u0161le p\u0159\u00edkaz <code>STARTTLS<\/code> a spojen\u00ed se \u201eupgraduje\u201c na TLS tunel.<\/li>\n\n\n<li>Teprve potom se pos\u00edlaj\u00ed p\u0159ihla\u0161ovac\u00ed \u00fadaje a samotn\u00e1 po\u0161ta.<\/li>\n\n<\/ol>\n\n\n\n<p>Teoreticky m\u016f\u017ee stejn\u00fd port obsluhovat i neza\u0161ifrovan\u00fd provoz, ale v roce 2026 je server, kter\u00fd na 587 nevynucuje \u0161ifrov\u00e1n\u00ed, vn\u00edman\u00fd jako nebezpe\u010dn\u00fd. V praxi je <strong>587 nejb\u011b\u017en\u011bj\u0161\u00ed a doporu\u010den\u00fd standard<\/strong> pro odes\u00edl\u00e1n\u00ed z aplikac\u00ed a web\u016f.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Port 2525: neofici\u00e1ln\u00ed, ale u\u017eite\u010dn\u00fd nouzov\u00fd v\u00fdchod<\/h3>\n\n\n\n<p>Port <strong>2525<\/strong> nen\u00ed ofici\u00e1ln\u00ed SMTP port. Je to \u201ealternativn\u00ed\u201c port, kter\u00fd n\u011bkte\u0159\u00ed poskytovatel\u00e9 SMTP a hostingy nab\u00edzej\u00ed jako fallback.<\/p>\n\n\n\n<p>Pou\u017eije\u0161 ho typicky tehdy, kdy\u017e ti hosting blokuje jak 587, tak 465. Nen\u00ed to b\u011b\u017en\u00e9, ale ob\u010das se to st\u00e1v\u00e1 \u2013 nap\u0159\u00edklad na n\u011bkter\u00fdch cloud platform\u00e1ch, kter\u00e9 blokuj\u00ed standardn\u00ed porty, aby zamezily spamu od vlastn\u00edch u\u017eivatel\u016f. \u0160ifrov\u00e1n\u00ed b\u00fdv\u00e1 stejn\u00e9 jako u 587 (STARTTLS).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Verdikt pro rok 2026: jak\u00fd SMTP port zvolit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Prim\u00e1rn\u00ed volba: port 587 (STARTTLS)<\/h3>\n\n\n\n<p>Pokud nastavuje\u0161 WordPress SMTP plugin nebo po\u0161tovn\u00edho klienta, port <strong>587<\/strong> se \u0161ifrov\u00e1n\u00edm <strong>STARTTLS (TLS)<\/strong> ber jako prvn\u00ed volbu. Je to standard pro submission a podporuje ho prakticky ka\u017ed\u00fd SMTP provider.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sekund\u00e1rn\u00ed volba: port 465 (SMTPS)<\/h3>\n\n\n\n<p>Kdy\u017e 587 z n\u011bjak\u00e9ho d\u016fvodu sel\u017ee (blokov\u00e1n\u00ed na hostingu, policy providera apod.) nebo kdy\u017e ti poskytovatel v\u00fdslovn\u011b doporu\u010d\u00ed 465 (\u010dast\u00e9 u Gmail\/Google Workspace), port <strong>465<\/strong> se <strong>SMTPS (SSL\/TLS)<\/strong> je v\u00fdborn\u00e1 a bezpe\u010dn\u00e1 alternativa.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T\u00e9m\u011b\u0159 nikdy: port 25<\/h3>\n\n\n\n<p>Port <strong>25<\/strong> nepat\u0159\u00ed do konfigurace webu pro odes\u00edl\u00e1n\u00ed transak\u010dn\u00edch e-mail\u016f. Je ur\u010den prim\u00e1rn\u011b pro server\u2013server relay a nav\u00edc je masivn\u011b blokovan\u00fd.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Srovn\u00e1n\u00ed port\u016f v praxi (rychl\u00e1 tabulka)<\/h3>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#24292e\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#e1e4e8;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>Port  | Protokol | Zabezpe\u010den\u00ed               | Typick\u00e9 pou\u017eit\u00ed                 | Pro web?\n----- | -------- | ------------------------ | ------------------------------- | --------\n25    | SMTP     | \u017e\u00e1dn\u00e9                    | server\u2013server relay             | NE (\u010dasto blokovan\u00e9)\n465   | SMTPS    | implicitn\u00ed SSL\/TLS       | client\/web \u2192 server (submission)| Ano (b\u011b\u017en\u00e9 a bezpe\u010dn\u00e9)\n587   | SMTP     | explicitn\u00ed TLS (STARTTLS)| client\/web \u2192 server (submission)| Ano (doporu\u010den\u00fd standard)\n2525  | SMTP     | explicitn\u00ed TLS (STARTTLS)| fallback pro submission          | Jen kdy\u017e 587\/465 nejdou\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span>Port  | Protokol | Zabezpe\u010den\u00ed               | Typick\u00e9 pou\u017eit\u00ed                 | Pro web?<\/span><\/span>\n<span class=\"line\"><span>----- | -------- | ------------------------ | ------------------------------- | --------<\/span><\/span>\n<span class=\"line\"><span>25    | SMTP     | \u017e\u00e1dn\u00e9                    | server\u2013server relay             | NE (\u010dasto blokovan\u00e9)<\/span><\/span>\n<span class=\"line\"><span>465   | SMTPS    | implicitn\u00ed SSL\/TLS       | client\/web \u2192 server (submission)| Ano (b\u011b\u017en\u00e9 a bezpe\u010dn\u00e9)<\/span><\/span>\n<span class=\"line\"><span>587   | SMTP     | explicitn\u00ed TLS (STARTTLS)| client\/web \u2192 server (submission)| Ano (doporu\u010den\u00fd standard)<\/span><\/span>\n<span class=\"line\"><span>2525  | SMTP     | explicitn\u00ed TLS (STARTTLS)| fallback pro submission          | Jen kdy\u017e 587\/465 nejdou<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Jak opravit e-maily ve WordPressu: postup krok za krokem<\/h2>\n\n\n\n<p>Kdy\u017e u\u017e v\u00ed\u0161, jak\u00fd port m\u00e1 smysl, zb\u00fdv\u00e1 \u201ejen\u201c cel\u00e9 odes\u00edl\u00e1n\u00ed spr\u00e1vn\u011b postavit. N\u00ed\u017ee je typick\u00fd postup, kter\u00fd v praxi zlep\u0161\u00ed doru\u010ditelnost nejv\u00edc.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Krok 1: vyber dedikovan\u00e9ho poskytovatele pro transak\u010dn\u00ed e-maily<\/h3>\n\n\n\n<p>Prvn\u00ed krok je p\u0159estat se sna\u017eit odes\u00edlat po\u0161tu z webserveru. Pot\u0159ebuje\u0161 poskytovatele, kter\u00fd \u0159e\u0161\u00ed doru\u010ditelnost jako core byznys \u2013 tedy <strong>transactional email provider<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Co ti d\u00e1: profesion\u00e1ln\u00ed odes\u00edlac\u00ed server s reputac\u00ed (p\u0159es SMTP nebo API), logging, \u010dasto i ochranu proti probl\u00e9m\u016fm s doru\u010dov\u00e1n\u00edm.<\/li>\n\n\n<li>P\u0159\u00edklady slu\u017eeb: SendGrid, Brevo (d\u0159\u00edve Sendinblue), Mailgun, Postmark (pov\u011bstn\u011b vysok\u00e1 doru\u010ditelnost), Amazon SES (v\u00fdkonn\u00e9, ale slo\u017eit\u011bj\u0161\u00ed), Google Workspace \/ Gmail (pro n\u00edzk\u00e9 objemy jde, ale pro business se nedoporu\u010duje kv\u016fli limit\u016fm).<\/li>\n\n<\/ul>\n\n\n\n<p>Free tarify \u010dasto pokryj\u00ed mal\u00fd a\u017e st\u0159edn\u00ed web, pokud jde \u010dist\u011b o transak\u010dn\u00ed po\u0161tu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Krok 2: nastav DNS z\u00e1znamy SPF a DKIM (bez toho to nen\u00ed hotov\u00e9)<\/h3>\n\n\n\n<p>Tohle je nejkriti\u010dt\u011bj\u0161\u00ed technick\u00e1 \u010d\u00e1st. Jakmile si vybere\u0161 providera, mus\u00ed\u0161 sv\u011btu dok\u00e1zat, \u017ee m\u00e1 povolen\u00ed odes\u00edlat e-maily za tvou dom\u00e9nu. D\u011bl\u00e1 se to p\u0159es DNS z\u00e1znamy, kter\u00e9 ti provider p\u0159esn\u011b vygeneruje (ty jen kop\u00edruje\u0161 do spr\u00e1vy DNS).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>SPF (Sender Policy Framework): TXT z\u00e1znam, kter\u00fd funguje jako seznam povolen\u00fdch odes\u00edlatel\u016f. \u0158\u00edk\u00e1 p\u0159\u00edjemc\u016fm: \u201eE-maily z <code>moje-domena.cz<\/code> jsou legitimn\u00ed jen, kdy\u017e p\u0159ijdou z t\u011bchto IP \/ slu\u017eeb (nap\u0159. m\u016fj server a SendGrid).\u201c T\u00edm br\u00e1n\u00ed spoofingu adresy.<\/li>\n\n\n<li>DKIM (DomainKeys Identified Mail): TXT z\u00e1znam s ve\u0159ejn\u00fdm kl\u00ed\u010dem pro digit\u00e1ln\u00ed podpis. Provider podepisuje odchoz\u00ed po\u0161tu priv\u00e1tn\u00edm kl\u00ed\u010dem a p\u0159\u00edjemce si pomoc\u00ed ve\u0159ejn\u00e9ho kl\u00ed\u010de z DNS ov\u011b\u0159\u00ed, \u017ee e-mail nebyl cestou zm\u011bn\u011bn.<\/li>\n\n<\/ul>\n\n\n\n<div class=\"wp-block-group callout callout-danger is-style-danger is-layout-flow wp-block-group-is-layout-flow\" style=\"border-width:1px;border-radius:8px;padding-top:1rem;padding-right:1.5rem;padding-bottom:1rem;padding-left:1.5rem\">\n\n<h4 class=\"wp-block-heading callout-title\">SPF a DKIM nejsou voliteln\u00e9<\/h4>\n\n\n<p>Bez SPF a DKIM bude i dobr\u00fd SMTP provider \u010dasto bojovat se spam folderem. Pokud ti transak\u010dn\u00ed e-maily padaj\u00ed do spamu, za\u010dni kontrolou DNS \u2013 a po\u010d\u00edtej s t\u00edm, \u017ee propagace m\u016f\u017ee trvat hodiny.<\/p>\n\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Krok 3: nainstaluj SMTP plugin do WordPressu a p\u0159esm\u011bruj <code>wp_mail()<\/code><\/h3>\n\n\n\n<p>Te\u010f mus\u00ed\u0161 WordPress donutit, aby m\u00edsto v\u00fdchoz\u00edho <code>wp_mail()<\/code> pos\u00edlal p\u0159es nov\u00e9ho providera. Nej\u010dast\u011bji se to \u0159e\u0161\u00ed pluginem, kter\u00fd <code>wp_mail()<\/code> \u201eodchyt\u00ed\u201c a po\u0161tu p\u0159esm\u011bruje.<\/p>\n\n\n\n<p>B\u011b\u017en\u011b pou\u017e\u00edvan\u00e9 pluginy: WP Mail SMTP, FluentSMTP, Post SMTP.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Obecn\u00fd postup konfigurace (plat\u00ed pro v\u011bt\u0161inu SMTP plugin\u016f)<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>Nainstaluj a aktivuj SMTP plugin.<\/li>\n\n\n<li>V administraci otev\u0159i jeho nastaven\u00ed.<\/li>\n\n\n<li>Vyber \u201eMailer\u201c (konkr\u00e9tn\u00edho providera), pokud ho plugin nab\u00edz\u00ed (nap\u0159. SendGrid).<\/li>\n\n\n<li>Zadej p\u0159ihla\u0161ov\u00e1n\u00ed: nejlep\u0161\u00ed varianta b\u00fdv\u00e1 <strong>API key<\/strong> (bezpe\u010dn\u011bj\u0161\u00ed a spolehliv\u011bj\u0161\u00ed). Pokud zvol\u00ed\u0161 \u201eOther SMTP\u201c, zad\u00e1v\u00e1\u0161 \u00fadaje ru\u010dn\u011b.<\/li>\n\n\n<li>Kdy\u017e jede\u0161 p\u0159es klasick\u00e9 SMTP p\u0159ihla\u0161ov\u00e1n\u00ed, vypl\u0148 SMTP parametry:<\/li>\n\n\n<li>&#8211; <strong>SMTP Host<\/strong>: dod\u00e1 provider (nap\u0159. <code>smtp.sendgrid.net<\/code>).<\/li>\n\n\n<li>&#8211; <strong>Encryption<\/strong>: zvol <strong>TLS<\/strong> (tj. STARTTLS). Pokud vid\u00ed\u0161 jen \u201eSSL\u201c, typicky to znamen\u00e1 SMTPS.<\/li>\n\n\n<li>&#8211; <strong>SMTP Port<\/strong>: <strong>587<\/strong> pro TLS\/STARTTLS, nebo <strong>465<\/strong> pro SSL\/SMTPS.<\/li>\n\n\n<li>&#8211; <strong>Authentication<\/strong>: zapnout.<\/li>\n\n\n<li>&#8211; <strong>SMTP Username<\/strong>: dod\u00e1 provider.<\/li>\n\n\n<li>&#8211; <strong>SMTP Password<\/strong>: dod\u00e1 provider.<\/li>\n\n\n<li>Nastav \u201eFrom Email\u201c (mus\u00ed b\u00fdt z autentizovan\u00e9 dom\u00e9ny) a \u201eFrom Name\u201c (nap\u0159. n\u00e1zev webu).<\/li>\n\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Krok 4: po\u0161li test a sleduj logy<\/h3>\n\n\n\n<p>Kvalitn\u00ed SMTP pluginy maj\u00ed sekci typu \u201eTest Email\u201c. Po\u0161li test na vlastn\u00ed Gmail\/Outlook adresu.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Dorazilo do inboxu: konfigurace je v z\u00e1sad\u011b hotov\u00e1.<\/li>\n\n\n<li>Spadlo do spamu: zkontroluj SPF\/DKIM, p\u0159\u00edpadn\u011b po\u010dkej na propagaci DNS.<\/li>\n\n\n<li>Odesl\u00e1n\u00ed sel\u017ee: typicky probl\u00e9m s portem nebo p\u0159ihla\u0161ovac\u00edmi \u00fadaji. Zkontroluj host\/port\/username\/password. Kdy\u017e nejde 587 s TLS, zkus 465 se SSL (nebo opa\u010dn\u011b).<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u201eJednoduch\u00e9\u201c \u0159e\u0161en\u00ed: kdy\u017e to platforma vy\u0159e\u0161\u00ed za tebe<\/h2>\n\n\n\n<p>\u010cty\u0159i kroky v\u00fd\u0161e jsou pro v\u00fdvoj\u00e1\u0159e rutina, ale pro b\u011b\u017en\u00e9ho majitele webu je to kombinace t\u0159\u00ed syst\u00e9m\u016f (registr\u00e1tor dom\u00e9ny, SMTP provider, WordPress plugin) a n\u011bkolika m\u00edst, kde se d\u00e1 n\u011bco pokazit. Proto vznikaj\u00ed integrovan\u00e1 \u0159e\u0161en\u00ed, kter\u00e1 \u010d\u00e1st tohoto \u0159et\u011bzce schovaj\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Varianta 1: integrovan\u00fd transak\u010dn\u00ed e-mail bez konfigurace<\/h3>\n\n\n\n<p>Pokud je tv\u016fj hlavn\u00ed probl\u00e9m neautentizovan\u00e9 odes\u00edl\u00e1n\u00ed z WordPressu, d\u00e1v\u00e1 smysl s\u00e1hnout po pluginu, kter\u00fd to obejde bez ru\u010dn\u00edho nastavov\u00e1n\u00ed port\u016f, API kl\u00ed\u010d\u016f a DNS z\u00e1znam\u016f.<\/p>\n\n\n\n<p>P\u0159\u00edklad: <a href=\"https:\/\/elementor.com\/products\/site-mailer\">Site Mailer by Elementor<\/a>. Je prezentovan\u00fd jako plugin typu \u201ezero-configuration\u201c:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Jak to funguje: nainstaluje\u0161 a aktivuje\u0161 \u2013 bez dal\u0161\u00ed konfigurace.<\/li>\n\n\n<li>Co to d\u011bl\u00e1: automaticky p\u0159esm\u011bruje transak\u010dn\u00ed e-maily webu (kontaktn\u00ed formul\u00e1\u0159e, WooCommerce, reset hesla apod.) p\u0159es autentizovanou slu\u017ebu s vysokou doru\u010ditelnost\u00ed.<\/li>\n\n\n<li>Pro\u010d je to praktick\u00e9: ne\u0159e\u0161\u00ed\u0161 registraci u SendGrid\/Brevo, ne\u0159e\u0161\u00ed\u0161 API keys, ne\u0159e\u0161\u00ed\u0161 SPF\/DKIM ani volbu portu. C\u00edl je, aby to fungovalo \u201ena jedno kliknut\u00ed\u201c.<\/li>\n\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Varianta 2: managed hosting, kter\u00fd ti neh\u00e1\u017ee klacky pod nohy<\/h3>\n\n\n\n<p>Druh\u00e1 \u010d\u00e1st probl\u00e9mu b\u00fdv\u00e1 infrastruktura \u2013 n\u011bkter\u00e9 hostingy jsou restriktivn\u00ed a porty pro submission blokuj\u00ed. Kvalitn\u00ed managed WordPress hosting s t\u00edm po\u010d\u00edt\u00e1 a sna\u017e\u00ed se vytvo\u0159it prost\u0159ed\u00ed, ve kter\u00e9m m\u016f\u017ee\u0161 best practices v\u016fbec nasadit.<\/p>\n\n\n\n<p>Jako p\u0159\u00edklad b\u00fdv\u00e1 uv\u00e1d\u011bn <a href=\"https:\/\/elementor.com\/hosting\">Elementor Hosting<\/a>, kter\u00fd je postaven\u00fd na cloud infrastruktu\u0159e a m\u00e1 c\u00edlit na to, aby nastaven\u00ed typu SMTP (v\u010detn\u011b dostupnosti port\u016f jako 587) \u0161lo ud\u011blat bez boje se serverem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">D\u016fle\u017eit\u00e1 hranice: transak\u010dn\u00ed vs. marketingov\u00e9 e-maily<\/h2>\n\n\n\n<p>Jakmile jednou oprav\u00ed\u0161 transak\u010dn\u00ed e-maily, p\u0159ijde nej\u010dast\u011bj\u0161\u00ed chyba: pos\u00edlat newslettery a hromadn\u00e9 kampan\u011b stejn\u00fdm kan\u00e1lem.<\/p>\n\n\n\n<p>Plat\u00ed jednoduch\u00e9 pravidlo: SMTP (nebo transak\u010dn\u00ed mail slu\u017ebu) pou\u017e\u00edvej pro transak\u010dn\u00ed e-maily, ale marketing pos\u00edlej p\u0159es specializovanou platformu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Transak\u010dn\u00ed e-maily (pos\u00edlej p\u0159es SMTP)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>reset hesla<\/li>\n\n\n<li>potvrzen\u00ed objedn\u00e1vky<\/li>\n\n\n<li>notifikace z formul\u00e1\u0159\u016f<\/li>\n\n\n<li>registrace u\u017eivatele \/ welcome email<\/li>\n\n\n<li>\u00fa\u010dtenky a syst\u00e9mov\u00e9 zpr\u00e1vy<\/li>\n\n<\/ul>\n\n\n\n<p>Tohle jsou o\u010dek\u00e1van\u00e9, \u201eone-to-one\u201c zpr\u00e1vy vyvolan\u00e9 akc\u00ed u\u017eivatele. Maj\u00ed vysokou prioritu a mus\u00ed dorazit do inboxu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Marketingov\u00e9 e-maily (pos\u00edlej p\u0159es ESP)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>newslettery<\/li>\n\n\n<li>promo kampan\u011b (sv\u00e1tky, slevy)<\/li>\n\n\n<li>ozn\u00e1men\u00ed novinek produkt\u016f<\/li>\n\n\n<li>broadcast na tis\u00edce kontakt\u016f<\/li>\n\n<\/ul>\n\n\n\n<p>Tohle jsou \u201eone-to-many\u201c hromadn\u00e9 z\u00e1silky. Kdy\u017e je za\u010dne\u0161 pos\u00edlat p\u0159es transak\u010dn\u00ed kan\u00e1l, naroste po\u010det odhl\u00e1\u0161en\u00ed a spam complaint\u016f, zhor\u0161\u00ed\u0161 reputaci dom\u00e9ny a postupn\u011b ti za\u010dnou padat do spamu i kritick\u00e9 transak\u010dn\u00ed zpr\u00e1vy. Na marketing proto pou\u017e\u00edvej email marketing platformu (ESP) typu Mailchimp nebo ConvertKit \u2013 ty jsou stav\u011bn\u00e9 na spr\u00e1vu odhl\u00e1\u0161en\u00ed, reputace a analytiky odd\u011blen\u011b od transak\u010dn\u00ed po\u0161ty.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Doporu\u010den\u00e1 strategie pro rok 2026 (prakticky, bez magie)<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>Stabiln\u00ed z\u00e1klad: hosting, kter\u00fd ti umo\u017en\u00ed implementovat best practices a zbyte\u010dn\u011b neblokuje submission porty (nap\u0159. 587).<\/li>\n\n\n<li>Spolehliv\u00fd transak\u010dn\u00ed kan\u00e1l: bu\u010f \u201ezero-config\u201c \u0159e\u0161en\u00ed typu <a href=\"https:\/\/elementor.com\/products\/site-mailer\">Site Mailer by Elementor<\/a>, nebo ru\u010dn\u011b nastaven\u00fd SMTP plugin (nap\u0159. WP Mail SMTP) s providerem typu SendGrid \u2013 prim\u00e1rn\u011b na portu <strong>587<\/strong>.<\/li>\n\n\n<li>Marketing odd\u011blen\u011b: newslettery a kampan\u011b pos\u00edlej p\u0159es dedikovan\u00fd ESP, aby sis chr\u00e1nil reputaci pro transak\u010dn\u00ed e-maily.<\/li>\n\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ: nej\u010dast\u011bj\u0161\u00ed ot\u00e1zky kolem SMTP port\u016f a WordPress e-mail\u016f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1) Jak\u00e1 je nejjednodu\u0161\u0161\u00ed odpov\u011b\u010f \u2013 kter\u00fd SMTP port m\u00e1m pou\u017e\u00edt?<\/h3>\n\n\n\n<p>Pou\u017eij port <strong>587<\/strong> se \u0161ifrov\u00e1n\u00edm <strong>STARTTLS<\/strong>. Pokud to nefunguje, dal\u0161\u00ed nejlep\u0161\u00ed volba je port <strong>465<\/strong> se <strong>SMTPS<\/strong> (SSL\/TLS).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2) Pro\u010d nem\u00e1m pou\u017e\u00edvat port 25?<\/h3>\n\n\n\n<p>Port 25 je p\u016fvodn\u00ed ne\u0161ifrovan\u00fd SMTP port z roku 1982, masivn\u011b zneu\u017e\u00edvan\u00fd pro spam. Proto je dnes blokovan\u00fd t\u00e9m\u011b\u0159 v\u0161emi reziden\u010dn\u00edmi ISP a mnoha <a href=\"https:\/\/elementor.com\/blog\/cloud-hosting\/ \"10 Best Cloud Hosting for WordPress in 2025\"\">cloud hosting<\/a> providery. Pro odes\u00edl\u00e1n\u00ed z webu ti typicky nebude fungovat.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3) Jak\u00fd je rozd\u00edl mezi 587 (STARTTLS) a 465 (SMTPS)?<\/h3>\n\n\n\n<p>Oba porty jsou bezpe\u010dn\u00e9. Port <strong>465<\/strong> pou\u017e\u00edv\u00e1 <em>Implicit TLS<\/em> \u2013 \u0161ifrov\u00e1n\u00ed se nav\u00e1\u017ee okam\u017eit\u011b p\u0159i p\u0159ipojen\u00ed. Port <strong>587<\/strong> pou\u017e\u00edv\u00e1 <em>Explicit TLS<\/em> p\u0159es p\u0159\u00edkaz STARTTLS \u2013 spojen\u00ed za\u010dne textov\u011b a pak se upgraduje na \u0161ifrovan\u00e9. Port 587 je modern\u00ed doporu\u010den\u00fd standard, ale oba p\u0159\u00edstupy b\u011b\u017en\u011b funguj\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4) Co je \u201etransak\u010dn\u00ed e-mail\u201c?<\/h3>\n\n\n\n<p>Je to \u201eone-to-one\u201c e-mail vyvolan\u00fd akc\u00ed u\u017eivatele na webu: zpr\u00e1vy z formul\u00e1\u0159\u016f, reset hesla, registrace, a potvrzen\u00ed objedn\u00e1vek v e-commerce. Tyhle e-maily maj\u00ed chodit p\u0159es dedikovanou SMTP slu\u017ebu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5) V \u010dem se transak\u010dn\u00ed e-mail li\u0161\u00ed od marketingov\u00e9ho?<\/h3>\n\n\n\n<p>Marketingov\u00fd e-mail je \u201eone-to-many\u201c broadcast (newsletter nebo promo). Na to pou\u017e\u00edvej separ\u00e1tn\u00ed platformu (ESP), jinak riskuje\u0161 zhor\u0161en\u00ed reputace a n\u00e1sledn\u00fd p\u00e1d transak\u010dn\u00edch e-mail\u016f do spamu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6) Co jsou SPF a DKIM a fakt je pot\u0159ebuju?<\/h3>\n\n\n\n<p>Ano, pot\u0159ebuje\u0161 je. Jsou to DNS z\u00e1znamy, kter\u00e9 dokazuj\u00ed legitimitu odes\u00edl\u00e1n\u00ed. <strong>SPF<\/strong> je seznam server\u016f, kter\u00e9 sm\u011bj\u00ed odes\u00edlat za tvou dom\u00e9nu. <strong>DKIM<\/strong> je digit\u00e1ln\u00ed podpis, kter\u00fd p\u0159\u00edjemci ov\u011b\u0159uj\u00ed proti ve\u0159ejn\u00e9mu kl\u00ed\u010di v DNS. Bez nich budou e-maily vypadat jako spam.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7) SMTP plugin se pt\u00e1 na \u201eHost\u201c. Co to je?<\/h3>\n\n\n\n<p>\u201eHost\u201c je adresa SMTP serveru tv\u00e9ho providera. Nap\u0159\u00edklad SendGrid pou\u017e\u00edv\u00e1 <code>smtp.sendgrid.net<\/code> a Google <code>smtp.gmail.com<\/code>. P\u0159esnou hodnotu ti d\u00e1 provider v dokumentaci\/nastaven\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8) M\u016f\u017eu pos\u00edlat webov\u00e9 e-maily p\u0159es sv\u016fj b\u011b\u017en\u00fd Gmail \u00fa\u010det?<\/h3>\n\n\n\n<p>Technicky m\u016f\u017ee\u0161, ale ned\u00e1v\u00e1 to moc smysl. Musel bys m\u00edt p\u0159\u00edstupov\u00e9 \u00fadaje k osobn\u00ed schr\u00e1nce v administraci WordPressu (bezpe\u010dnostn\u00ed riziko) a Google m\u00e1 p\u0159\u00edsn\u00e9 limity odes\u00edl\u00e1n\u00ed. P\u0159i \u0161pi\u010dce provozu m\u016f\u017ee Google \u00fa\u010det do\u010dasn\u011b omezit. Pro firemn\u00ed web je lep\u0161\u00ed dedikovan\u00fd provider.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">9) Jak\u00e1 je nejjednodu\u0161\u0161\u00ed cesta, jak ve WordPressu vy\u0159e\u0161it doru\u010dov\u00e1n\u00ed e-mail\u016f?<\/h3>\n\n\n\n<p>Pou\u017e\u00edt plugin bez konfigurace typu <a href=\"https:\/\/elementor.com\/products\/site-mailer\">Site Mailer by Elementor<\/a>, kter\u00fd p\u0159esm\u011bruje transak\u010dn\u00ed e-maily p\u0159es slu\u017ebu s vysokou doru\u010ditelnost\u00ed bez nastavov\u00e1n\u00ed port\u016f a API kl\u00ed\u010d\u016f.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">10) Jak otestuju, \u017ee SMTP nastaven\u00ed funguje?<\/h3>\n\n\n\n<p>V\u011bt\u0161ina SMTP plugin\u016f (nap\u0159. WP Mail SMTP) m\u00e1 p\u0159\u00edmo v nastaven\u00ed z\u00e1lo\u017eku \u201eTest Email\u201c. Ode\u0161li test z administrace na vlastn\u00ed adresu (Gmail\/Outlook). Pokud to doraz\u00ed do inboxu, jsi v z\u00e1sad\u011b hotov\u00fd.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Z\u00e1v\u011br: spr\u00e1vn\u00fd port je jen za\u010d\u00e1tek, ale 587 je tvoje v\u00fdchoz\u00ed volba<\/h2>\n\n\n\n<p>Ot\u00e1zka \u201ekter\u00fd SMTP port m\u00e1m pou\u017e\u00edt\u201c m\u00e1 v roce 2026 pom\u011brn\u011b jasnou odpov\u011b\u010f: <strong>587 se STARTTLS<\/strong>. Pokud naraz\u00ed\u0161 na blokaci nebo doporu\u010den\u00ed providera, <strong>465 se SMTPS<\/strong> je bezpe\u010dn\u00e1 a b\u011b\u017en\u00e1 alternativa. Port 25 nech pro server\u2013server relay a do WordPressu ho netahej.<\/p>\n\n\n\n<p>Je\u0161t\u011b d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e samotn\u00fd port je ale zm\u011bna p\u0159\u00edstupu: p\u0159estat spol\u00e9hat na v\u00fdchoz\u00ed <code>wp_mail()<\/code> a pos\u00edlat transak\u010dn\u00ed e-maily p\u0159es autentizovanou slu\u017ebu, ide\u00e1ln\u011b se spr\u00e1vn\u011b nastaven\u00fdm SPF a DKIM. T\u00edm z webu ud\u011bl\u00e1\u0161 spolehliv\u00fd komunika\u010dn\u00ed kan\u00e1l \u2013 a p\u0159estane\u0161 p\u0159ich\u00e1zet o popt\u00e1vky i z\u00e1kazn\u00edky kv\u016fli e-mail\u016fm, kter\u00e9 se ztratily cestou.<\/p>\n\n\n<div class=\"references-section\">\n                <h2>Reference \/ Zdroje<\/h2>\n                <ul class=\"references-list\"><li><a href=\"https:\/\/elementor.com\/blog\/smtp-ports-explained\/\" target=\"_blank\" rel=\"noopener noreferrer\">SMTP Ports Explained: The Right Choice for Email Deliverability in 2026<\/a><\/li><li><a href=\"https:\/\/elementor.com\/blog\/encryption\/\" target=\"_blank\" rel=\"noopener noreferrer\">What is Encryption, and How Does it Work? 2025 Guide<\/a><\/li><li><a href=\"https:\/\/elementor.com\/pages\/seo\/cloud-based-web-hosting\/\" target=\"_blank\" rel=\"noopener noreferrer\">Best Cloud-Based Web Hosting<\/a><\/li><li><a href=\"https:\/\/elementor.com\/blog\/cloud-hosting\/\" target=\"_blank\" rel=\"noopener noreferrer\">10 Best Cloud Hosting for WordPress in 2025<\/a><\/li><li><a href=\"https:\/\/elementor.com\/products\/site-mailer\" target=\"_blank\" rel=\"noopener noreferrer\">Site Mailer by Elementor<\/a><\/li><li><a href=\"https:\/\/elementor.com\/hosting\" target=\"_blank\" rel=\"noopener noreferrer\">Elementor Hosting<\/a><\/li><li><a href=\"https:\/\/elementor.com\/features\/woocommerce-builder\/\" target=\"_blank\" rel=\"noopener noreferrer\">WooCommerce Builder<\/a><\/li><li><a href=\"https:\/\/elementor.com\/wordpress\" target=\"_blank\" rel=\"noopener noreferrer\">WordPress<\/a><\/li><li><a href=\"https:\/\/elementor.com\/features\/ecommerce\/\" target=\"_blank\" rel=\"noopener noreferrer\">eCommerce<\/a><\/li><\/ul>\n            <\/div>","protected":false},"excerpt":{"rendered":"<p>Kontaktn\u00ed formul\u00e1\u0159 nic nepos\u00edl\u00e1, WooCommerce potvrzen\u00ed objedn\u00e1vky nedoraz\u00ed a reset hesla kon\u010d\u00ed ve spamu? Ve v\u011bt\u0161in\u011b p\u0159\u00edpad\u016f je na vin\u011b \u0161patn\u00fd zp\u016fsob odes\u00edl\u00e1n\u00ed e-mail\u016f \u2013 a \u010dasto i \u0161patn\u011b zvolen\u00fd SMTP port.<\/p>\n","protected":false},"author":35,"featured_media":176,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[119,118,5,45,10],"class_list":["post-178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-webovy-vyvoj","tag-dns","tag-email-deliverability","tag-smtp","tag-woocommerce","tag-wordpress"],"_links":{"self":[{"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/posts\/178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/users\/35"}],"replies":[{"embeddable":true,"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/comments?post=178"}],"version-history":[{"count":0,"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/posts\/178\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/media\/176"}],"wp:attachment":[{"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/media?parent=178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/categories?post=178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/helloblog.io\/cs\/wp-json\/wp\/v2\/tags?post=178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}