The SMTP p\u0159ipojen\u00ed<\/b> je zalo\u017eeno na takzvan\u00e9m TCP spojen\u00ed, co\u017e je zkratka pro Transmission Control Protocol. SMTP nebo Simple Mail Transfer Protocol je aplikace pou\u017e\u00edvan\u00e1 k odes\u00edl\u00e1n\u00ed, p\u0159ij\u00edm\u00e1n\u00ed a p\u0159epos\u00edl\u00e1n\u00ed odchoz\u00edch e-mail\u016f mezi odes\u00edlateli a p\u0159\u00edjemci. Kdy\u017e je e-mail odesl\u00e1n, je p\u0159en\u00e1\u0161en z jednoho serveru na druh\u00fd p\u0159es internet pomoc\u00ed SMTP. Jednodu\u0161e \u0159e\u010deno, an SMTP email<\/b> je pouze e-mail odeslan\u00fd p\u0159es SMTP server..<\/p>\n
<\/p>\n
The SMTP server<\/b> ve spole\u010dnosti Yahoo potvrzuje zpr\u00e1vu EHLO t\u00edm, \u017ee odpov\u00ed k\u00f3dem \u201e250\u201c spolu se slu\u017ebami, kter\u00e9 m\u016f\u017ee server SMTP podporovat. Je d\u016fle\u017eit\u00e9, aby se klient a server dohodli na slu\u017eb\u00e1ch a funkc\u00edch, kter\u00e9 mohou podporovat, ne\u017e za\u010dne p\u0159enos zpr\u00e1vy. tak\u017ee e-mailov\u00e1 zpr\u00e1va, kterou Bob napsal na sv\u00e9m laptopu, skon\u010d\u00ed na po\u010d\u00edta\u010di Yahoo a \u010dek\u00e1, a\u017e si ji Alice vyzvedne a p\u0159e\u010dte. Jedna v\u011bc v\u0161ak st\u00e1le chyb\u00ed: Spojen\u00ed mezi klientem SMTP a serverem SMTP je uzav\u0159eno.<\/p>\n
Nejprve si promluvme o Bobov\u011b stran\u011b p\u0159\u00edb\u011bhu a po\u0161leme jeho e-mailovou zpr\u00e1vu na Gmail na jeho po\u0161tovn\u00ed server. Server SMTP je po\u010d\u00edta\u010d nebo aplikace, kter\u00e1 je zodpov\u011bdn\u00e1 za odes\u00edl\u00e1n\u00ed e-mail\u016f. Funguje podle protokolu SMTP (Simple Mail Transfer Protocol). Server SMTP p\u0159ij\u00edm\u00e1 e-maily z e-mailov\u00e9ho klienta.<\/p>\n
Pot\u00e9 je p\u0159ed\u00e1 jin\u00e9mu serveru SMTP a p\u0159ed\u00e1 serveru p\u0159\u00edchoz\u00ed po\u0161ty. Protokol SMTP (Simple Mail Transfer Protocol) je zalo\u017een na doru\u010dov\u00e1n\u00ed zpr\u00e1v typu end-to-end. Klient SMTP (Simple Mail Transfer Protocol) kontaktuje server SMTP (Simple Mail Transfer Protocol) c\u00edlov\u00e9ho hostitele na zn\u00e1m\u00e9m portu 25, aby doru\u010dil e-mail. Klient pot\u00e9 \u010dek\u00e1, a\u017e server ode\u0161le zpr\u00e1vu 220 READY FOR MAIL..<\/p>\n
Po p\u0159ijet\u00ed zpr\u00e1vy 220 klient ode\u0161le p\u0159\u00edkaz HELO. Server pak odpov\u00ed 250 po\u017eadovan\u00fdmi akcemi po\u0161ty, dob\u0159e... Mus\u00edte se zamyslet nad t\u00edm, co je SMTP nebo co je SMTP server?. Protokol SMTP nebo serverov\u00fd protokol pro p\u0159enos po\u0161ty je soubor pravidel pro digit\u00e1ln\u00ed komunikaci, tj. p\u0159enos elektronick\u00e9 po\u0161ty a SMTP servery<\/b> jsou aplikace, jejich\u017e prim\u00e1rn\u00ed funkc\u00ed je odes\u00edlat, p\u0159ij\u00edmat nebo p\u0159ep\u00ednat odes\u00edlatele a p\u0159\u00edjemce odchoz\u00ed po\u0161ty.<\/p>\n
Existuje mnoho bezplatn\u00fdch server\u016f SMTP online, kter\u00e9 m\u016f\u017eete pou\u017e\u00edt k bezplatn\u00e9mu odes\u00edl\u00e1n\u00ed e-mail\u016f. Tento flexibiln\u011bj\u0161\u00ed syst\u00e9m se snadno pou\u017e\u00edv\u00e1 pro mobiln\u00ed u\u017eivatele a poskytuje jim pevn\u00fd v\u00fdb\u011br nakonfigurovan\u00fdch server\u016f SMTP pro odchoz\u00ed provoz.. Vyvinuti agenti pro p\u0159enos po\u0161ty (MTAs) po sendmailu byly obvykle implementov\u00e1ny tak\u00e9 \u010dist\u011b 8bitov\u00e9, tak\u017ee alternativn\u00ed strategie \u201ejen poslat osm\u201c mohla b\u00fdt pou\u017eita k p\u0159enosu libovoln\u00fdch textov\u00fdch dat (v jak\u00e9mkoli 8bitov\u00e9m k\u00f3dov\u00e1n\u00ed znak\u016f podobn\u00e9ho ASCII) p\u0159es SMTP. Pln\u011b vybaven\u00e9 servery SMTP spravuj\u00ed fronty zpr\u00e1v, aby se znovu pokusily o p\u0159enos zpr\u00e1v, kter\u00e9 zp\u016fsobily do\u010dasn\u00e9 v\u00fdpadky.<\/p>\n
Sendmail, vydan\u00fd v roce 1982 s 4.1CBSD, kr\u00e1tce po vyd\u00e1n\u00ed RFC 788 v listopadu 1981, byl jedn\u00edm z prvn\u00edch agent\u016f pro p\u0159enos po\u0161ty, kte\u0159\u00ed implementovali SMTP. Shroma\u017e\u010fuje e-maily odes\u00edlatele a doru\u010duje je na m\u00edstn\u00ed po\u0161tu p\u0159\u00edjemce, co\u017e je dal\u0161\u00ed server SMTP. Slu\u017ebu p\u0159enosu SMTP lze pou\u017e\u00edt k vy\u0159e\u0161en\u00ed mnoha probl\u00e9m\u016f, jako je doru\u010dov\u00e1n\u00ed e-mail\u016f, blacklisting IP atd.. SMTP na druh\u00e9 stran\u011b funguje nejl\u00e9pe, kdy\u017e jsou odes\u00edlaj\u00edc\u00ed i p\u0159ij\u00edmaj\u00edc\u00ed po\u010d\u00edta\u010de neust\u00e1le p\u0159ipojeny k s\u00edti.<\/p>\n
SMTP AUTH lze pou\u017e\u00edt k tomu, aby legitimn\u00ed u\u017eivatel\u00e9 mohli p\u0159epos\u00edlat e-maily a z\u00e1rove\u0148 odm\u00edtali slu\u017ebu p\u0159epos\u00edl\u00e1n\u00ed neopr\u00e1vn\u011bn\u00fdm u\u017eivatel\u016fm, jako jsou spamme\u0159i. Adresa SMTP se pou\u017e\u00edv\u00e1 k odesl\u00e1n\u00ed va\u0161\u00ed e-mailov\u00e9 zpr\u00e1vy na spr\u00e1vn\u00e9 za\u0159\u00edzen\u00ed nebo c\u00edl prost\u0159ednictv\u00edm spr\u00e1vn\u00e9ho komunika\u010dn\u00edho kan\u00e1lu. Doporu\u010duje se pou\u017e\u00edvat slu\u017eby t\u0159et\u00edch stran, jako je Pepipost SMTP, je mnohem spolehliv\u011bj\u0161\u00ed. Poj\u010fme se pod\u00edvat na to, jak m\u016f\u017eete Pepipost pou\u017e\u00edt pro sv\u00e9 weby WordPress b\u011bhem okam\u017eiku \u2014. M\u016f\u017eete tak\u00e9 zv\u00e1\u017eit nastaven\u00ed m\u00edstn\u00edho fale\u0161n\u00e9ho SMTP serveru, jako je MailHog nebo MailCatcher, nebo dokonce desktopov\u00e9 aplikace, jako je FakeSMTP nebo DevNull SMTP.<\/p>\n
V lekci Simple Mail Transfer Protocol (SMTP) \u2013 Jak funguje SMTP se nau\u010d\u00edte z\u00e1klady Simple Mail Transfer Protocol (SMTP), RFC souvisej\u00edc\u00ed s Simple Mail Transfer Protocol (SMTP) a jak funguje Simple Mail Transfer Protocol (SMTP). . Roz\u0161\u00ed\u0159en\u00ed STARTTLS umo\u017e\u0148uj\u00ed podporu serveru SMTP informovat p\u0159ipojuj\u00edc\u00ed se klienty, \u017ee podporuj\u00ed \u0161ifrovanou komunikaci TLS, a umo\u017e\u0148uj\u00ed klient\u016fm aktualizovat sv\u00e9 p\u0159ipojen\u00ed odesl\u00e1n\u00edm p\u0159\u00edkazu STARTTLS. P\u016fvodn\u00ed protokol SMTP podporoval pouze neov\u011b\u0159enou, ne\u0161ifrovanou 7bitovou textovou komunikaci ASCII, co\u017e je zraniteln\u00fd v\u016f\u010di trivi\u00e1ln\u00edm \u00fatok\u016fm typu man-in-the-middle, spoofingu a spamu a vy\u017eaduje, aby v\u0161echna bin\u00e1rn\u00ed data byla p\u0159ed p\u0159enosem zak\u00f3dov\u00e1na do \u010diteln\u00e9ho textu. Po\u010d\u00e1tky SMTP za\u010daly v roce 1971 a od sv\u00e9ho \u0161ir\u0161\u00edho zaveden\u00ed v roce 1981 byl mnohokr\u00e1t aktualizov\u00e1n, upravov\u00e1n a roz\u0161i\u0159ov\u00e1n.<\/p>\n
Je to \u00fapln\u011b stejn\u00fd proces, ale Bob\u016fv u\u017eivatelsk\u00fd agent je klient SMTP a Bob\u016fv po\u0161tovn\u00ed server je server SMTP.<\/p>\n
. .<\/p>","protected":false},"excerpt":{"rendered":"
P\u0159ipojen\u00ed SMTP je zalo\u017eeno na takzvan\u00e9m p\u0159ipojen\u00ed TCP, co\u017e je zkratka pro Transmission Control Protocol. SMTP nebo Simple Mail Transfer Protocol je aplikace pou\u017e\u00edvan\u00e1 k odes\u00edl\u00e1n\u00ed, p\u0159ij\u00edm\u00e1n\u00ed a p\u0159ed\u00e1v\u00e1n\u00ed odchoz\u00edch e-mail\u016f mezi odes\u00edlateli a p\u0159\u00edjemci. Kdy\u017e je e-mail odesl\u00e1n, je p\u0159en\u00e1\u0161en z jednoho serveru na druh\u00fd p\u0159es internet pomoc\u00ed SMTP. [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-215","post","type-post","status-publish","format-standard","hentry","category-smtp-simple-mail-transfer-protocol-faq"],"_links":{"self":[{"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/comments?post=215"}],"version-history":[{"count":0,"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/posts\/215\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/media?parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/categories?post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freesmtpserver.net\/cs\/wp-json\/wp\/v2\/tags?post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}