{"id":76169,"date":"2020-03-31T13:42:34","date_gmt":"2020-03-31T11:42:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/kak-rabotaet-elektronnaya-pochta"},"modified":"2020-03-31T13:42:34","modified_gmt":"2020-03-31T11:42:34","slug":"kak-rabotaet-elektronnaya-pochta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/kak-rabotaet-elektronnaya-pochta","title":{"rendered":"Ako funguje elektronick\u00e1 po\u0161ta","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Toto je za\u010diatok rozsiahleho kurzu o pr\u00e1ci s po\u0161tov\u00fdmi servermi. Nem\u00e1m za cie\u013e r\u00fdchlo nau\u010di\u0165 niekoho pracova\u0165 s po\u0161tov\u00fdmi servermi. Bude tu ve\u013ea dopl\u0148uj\u00facich inform\u00e1ci\u00ed, t\u00fdkaj\u00facich sa ot\u00e1zok, s ktor\u00fdmi sa na na\u0161ej ceste stretneme, preto\u017ee sa sna\u017e\u00edm prisp\u00f4sobi\u0165 kurz najm\u00e4 t\u00fdm, ktor\u00ed pr\u00e1ve za\u010d\u00ednaj\u00fa. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/4626a462456aaffbd0273fac45b49212.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">\u00davod<\/b>Tak u\u017e sa stalo, \u017ee si privyr\u00e1bam ako u\u010dite\u013e administr\u00e1cie Linuxu. A ako dom\u00e1cu \u00falohu d\u00e1vam \u0161tudentom desiatky odkazov na r\u00f4zne zdroje, preto\u017ee niekde je materi\u00e1lu nedostatok, niekde je pr\u00edli\u0161 zlo\u017eit\u00fd. A na r\u00f4znych zdrojoch sa \u010dasto materi\u00e1l duplicituje, a niekedy sa rozch\u00e1dza. Tie\u017e v\u00e4\u010d\u0161ina obsahu je v angli\u010dtine a s\u00fa \u0161tudenti, ktor\u00ed maj\u00fa s porozumen\u00edm \u0165a\u017ekosti. Existuj\u00fa skvel\u00e9 kurzy od Semaeva a Lebedeva, a mo\u017eno aj in\u00fdch, ale pod\u013ea m\u00f4jho n\u00e1zoru s\u00fa niektor\u00e9 t\u00e9my nedostato\u010dne rozobrat\u00e9, niektor\u00e9 s\u00fa nedostato\u010dne prepojen\u00e9 s in\u00fdmi.<\/p>\n<p>Preto som sa jedn\u00e9ho d\u0148a rozhodol nejak\u00fdm sp\u00f4sobom zhrn\u00fa\u0165 materi\u00e1l a poskytn\u00fa\u0165 ho \u0161tudentom v pohodlnej podobe. Ale ke\u010f u\u017e to rob\u00edm, pre\u010do sa o\u0148 nezdie\u013ea\u0165 so v\u0161etk\u00fdmi? Najprv som sa sna\u017eil robi\u0165 text a doplni\u0165 ho odkazmi, ale tak\u00fdch zdrojov s\u00fa mili\u00f3ny, a ak\u00fd je z toho prospech? Niekde ch\u00fdbala n\u00e1zornos\u0165 a vysvetlenia, niekde \u0161tudenti lenivo \u010d\u00edtaj\u00fa cel\u00fd text (a nielen oni) a vznikaj\u00fa medzery v znalostiach.<\/p>\n<p>Ale probl\u00e9m nie je len v \u0161tudentoch. Cel\u00fa svoju kari\u00e9ru som pracoval v IT integr\u00e1toroch, a to je obrovsk\u00e1 sk\u00fasenos\u0165 s r\u00f4znymi syst\u00e9mami. Nakoniec som sa stal multifunk\u010dn\u00fdm in\u017einierom. \u010casto sa stret\u00e1vam s IT odborn\u00edkmi v r\u00f4znych spolo\u010dnostiach a pomerne \u010dasto si v\u0161imnem, \u017ee maj\u00fa nedostatky v znalostiach. V IT oblasti je mnoho samoukov, vr\u00e1tane m\u0148a. A ja m\u00e1m t\u00fdch nedostatkov dos\u0165 a chcel by som pom\u00f4c\u0165 in\u00fdm a sebe zbavi\u0165 sa t\u00fdchto medzier.<\/p>\n<p>Pod\u013ea m\u0148a s\u00fa mal\u00e9 vide\u00e1 s inform\u00e1ciami zauj\u00edmavej\u0161ie a \u013eah\u0161ie sa osvojuj\u00fa, preto som sa rozhodol vysk\u00fa\u0161a\u0165 tento form\u00e1t. A viem, \u017ee m\u00f4j jazyk nie je najlep\u0161ie vyvinut\u00fd, \u0165a\u017eko sa ma po\u010d\u00fava, ale sna\u017e\u00edm sa zlep\u0161i\u0165. Pre m\u0148a je to nov\u00e9 hobby, ktor\u00e9 chcem rozv\u00edja\u0165. Predt\u00fdm som mal hor\u0161\u00ed mikrof\u00f3n, teraz sa preva\u017ene sna\u017e\u00edm rie\u0161i\u0165 probl\u00e9my so zvukom a re\u010dou. Chcem vytv\u00e1ra\u0165 kvalitn\u00fd obsah a ve\u013emi potrebujem objekt\u00edvnu kritiku a rady.<\/p>\n<p>P.S. Niektor\u00ed si mysleli, \u017ee video form\u00e1t nie je pr\u00e1ve najvhodnej\u0161\u00ed a \u017ee je lep\u0161ie to spravi\u0165 textom. Nes\u00fahlas\u00edm s t\u00fdm \u00faplne, ale nech je v\u00fdber \u2014 bu\u010f video, alebo text. <\/p>\n<p><b class=\"spoiler_title\">Video<\/b><center><div class=\"youtube-placeholder\" data-id=\"dDb9j9UqK2E\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/dDb9j9UqK2E\/hqdefault.jpg\" alt=\"Prehrajte video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p>\n\u010ealej &gt; <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/494906\/\">Re\u017eimy pr\u00e1ce po\u0161tov\u00fdch serverov<\/a><\/noindex><\/p>\n<p>Aby ste mohli pracova\u0165 s elektronickou po\u0161tou, potrebujete po\u0161tov\u00e9ho klienta. M\u00f4\u017ee to by\u0165 bu\u010f webov\u00fd klient, napr\u00edklad Gmail, OWA, Roundcube, alebo aplik\u00e1cia na po\u010d\u00edta\u010di \u2014 Outlook, Thunderbird a pod. Predpokladajme, \u017ee ste sa u\u017e zaregistrovali na nejakom po\u0161tovom servise a potrebujete nastavi\u0165 po\u0161tov\u00e9ho klienta. Otvor\u00edte program a ten sa v\u00e1s p\u00fdta na \u00fadaje: meno pre \u00fa\u010det, va\u0161u e-mailov\u00fa adresu a heslo. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/089c45f08398a7864f3a08d40ce41e3f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPotom, \u010do zad\u00e1te tieto \u00fadaje, v\u00e1\u0161 po\u0161tov\u00fd klient sa pok\u00fasi n\u00e1js\u0165 inform\u00e1cie o va\u0161om po\u0161tovom serveri. Toto sa rob\u00ed na zjednodu\u0161enie nastavenia pripojenia na server, preto\u017ee v\u00e4\u010d\u0161ina pou\u017e\u00edvate\u013eov nevie adresy a protokoly pripojenia. Na tento \u00fa\u010del pou\u017e\u00edvaj\u00fa po\u0161tov\u00ed klienti r\u00f4zne sp\u00f4soby vyh\u013ead\u00e1vania inform\u00e1ci\u00ed o serveri a nastaveniach pripojenia. Tieto sp\u00f4soby sa m\u00f4\u017eu l\u00ed\u0161i\u0165 v z\u00e1vislosti od po\u0161tov\u00e9ho klienta. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/fb3a21cb3ffe70327beabc187f371c99.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNapr\u00edklad, Outlook pou\u017e\u00edva met\u00f3du \u201eautodiscover\u201c, klient sa obracia na DNS server a p\u00fdta sa na ur\u010dit\u00fd z\u00e1znam autodiscover, ktor\u00fd je spojen\u00fd s t\u00fdm po\u0161tov\u00fdm dom\u00e9nom, ktor\u00fd ste uviedli v nastaveniach svojho po\u0161tov\u00e9ho klienta. Ak administr\u00e1tor nastavil tento z\u00e1znam na DNS serveri, ukazuje na webov\u00fd server.<\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/1203a1a11bedc5fdf2b8dcdd3aee663b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPotom, \u010do po\u0161tov\u00fd klient zist\u00ed adresu webservera, obr\u00e1ti sa na\u0148 a n\u00e1jde tam vopred pripraven\u00fd s\u00fabor so nastaveniami pripojenia k po\u0161tov\u00e9mu serveru vo form\u00e1te XML. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/1581f07ab0c164fc3c29f61482a26a5f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nV pr\u00edpade Thunderbird po\u0161tov\u00fd klient obch\u00e1dza vyh\u013ead\u00e1vanie DNS z\u00e1znamu autodiscover a okam\u017eite sa pok\u00fa\u0161a pripoji\u0165 na webserver autoconfig. a meno uveden\u00e9ho dom\u00e9ny. A tie\u017e sa pok\u00fa\u0161a na webserveri n\u00e1js\u0165 s\u00fabor s nastaveniami pripojenia vo form\u00e1te XML. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/c14e7bdd8916813cb5a5fe3bffc8db74.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAk po\u0161tov\u00fd klient nen\u00e1jde s\u00fabor s potrebn\u00fdmi nastaveniami, pok\u00fasi sa uh\u00e1dnu\u0165 nastavenia medzi \u010dasto pou\u017e\u00edvan\u00fdmi. Napr\u00edklad, ak sa dom\u00e9na naz\u00fdva example.com, po\u0161tov\u00fd server skontroluje, \u010di existuj\u00fa servery s n\u00e1zvami imap.example.com a smtp.example.com. Ak n\u00e1jde \u2014 zap\u00ed\u0161e to do nastaven\u00ed. Ak sa v\u0161ak po\u0161tov\u00fd klient nem\u00f4\u017ee nijak\u00fdm sp\u00f4sobom ur\u010di\u0165 adresu po\u0161tov\u00e9ho servera, pon\u00fakne pou\u017e\u00edvate\u013eovi, aby s\u00e1m zadal \u00fadaje pripojenia. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/88cf82a8d73b63756641f1da8dcb71ed.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPotom si v\u0161imnete 2 polia pre <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sk\/server\/\"   title=\"serverov\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1473\">serverov<\/a> \u2014 adresa servera pre prich\u00e1dzaj\u00facu po\u0161tu a adresa servera pre odch\u00e1dzaj\u00facu po\u0161tu. Vo v\u0161eobecnosti sa v mal\u00fdch organiz\u00e1ci\u00e1ch tieto adresy zhoduj\u00fa, aj ke\u010f s\u00fa uveden\u00e9 cez r\u00f4zne DNS men\u00e1, zatia\u013e \u010do v ve\u013ek\u00fdch spolo\u010dnostiach m\u00f4\u017eu by\u0165 r\u00f4zne servery. Ale nez\u00e1le\u017e\u00ed na tom, \u010di ide o ten ist\u00fd server alebo nie \u2014 slu\u017eby, ktor\u00e9 za nimi stoja, s\u00fa r\u00f4zne. Jedna z najpopul\u00e1rnej\u0161\u00edch kombin\u00e1ci\u00ed po\u0161tov\u00fdch slu\u017eieb je Postfix &amp; Dovecot. Kde Postfix funguje ako server odch\u00e1dzaj\u00facej po\u0161ty (MTA \u2014 mail transfer agent) a Dovecot ako server prich\u00e1dzaj\u00facej po\u0161ty (MDA \u2014 mail delivery agent). Ako nazna\u010duje n\u00e1zov, Postfix sa pou\u017e\u00edva na odosielanie po\u0161ty, zatia\u013e \u010do Dovecot sl\u00fa\u017ei na prij\u00edmanie po\u0161ty po\u0161tov\u00fdm klientom. Samotn\u00e9 po\u0161tov\u00e9 servery komunikuj\u00fa medzi sebou pomocou protokolu SMTP \u2014 t.j. Dovecot (MDA) je potrebn\u00fd pre pou\u017e\u00edvate\u013eov. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/deea1c6730f39a24d355806b5212996e.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPovedzme, \u017ee sme nastavili pripojenie k n\u00e1\u0161mu po\u0161tov\u00e9mu serveru. Po\u010fme sa pok\u00fasi\u0165 odosla\u0165 spr\u00e1vu. V spr\u00e1ve uv\u00e1dzame svoju adresu a adresu pr\u00edjemcu. Teraz, aby spr\u00e1vu doru\u010dil, v\u00e1\u0161 po\u0161tov\u00fd klient odo\u0161le spr\u00e1vu na v\u00e1\u0161 server odch\u00e1dzaj\u00facej po\u0161ty. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/9f0b7d58993b3de43d92329b1ce515ca.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKe\u010f v\u00e1\u0161 server prijme spr\u00e1vu, pok\u00fasi sa zisti\u0165, komu m\u00e1 spr\u00e1vu doru\u010di\u0165. V\u00e1\u0161 server nem\u00f4\u017ee pam\u00e4ta\u0165 adresy v\u0161etk\u00fdch po\u0161tov\u00fdch serverov, preto sa obracia na DNS, aby na\u0161iel \u0161peci\u00e1lny z\u00e1znam MX \u2014 ktor\u00fd ud\u00e1va po\u0161tov\u00fd server pre dan\u00fa dom\u00e9nu. Tieto z\u00e1znamy sa m\u00f4\u017eu l\u00ed\u0161i\u0165 pre r\u00f4zne subdom\u00e9ny. <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/b4890c1489f2711899bd7680d9d46183.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAkon\u00e1hle zist\u00ed adresu servera pr\u00edjemcu, odo\u0161le va\u0161u spr\u00e1vu cez SMTP na t\u00fato adresu, kde po\u0161tov\u00fd server (MTA) pr\u00edjemcu spr\u00e1vu prijme a ulo\u017e\u00ed do \u0161peci\u00e1lneho adres\u00e1ra, na ktor\u00fd sa tie\u017e pozer\u00e1 slu\u017eba zodpovedaj\u00faca za prij\u00edmanie spr\u00e1v klientmi (MDA). <\/p>\n<p><img decoding=\"async\" alt=\"Ako funguje elektronick\u00e1 po\u0161ta\" src=\"\/wp-content\/uploads\/2020\/03\/8ab07a77173f19331e46b15b133454ab.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKe\u010f sa po\u0161tov\u00fd klient pr\u00edjemcu nabud\u00face op\u00fdta servera prich\u00e1dzaj\u00facej po\u0161ty na nov\u00e9 spr\u00e1vy, MDA mu odo\u0161le va\u0161u spr\u00e1vu. <\/p>\n<p>Ale preto\u017ee po\u0161tov\u00e9 servery funguj\u00fa na internete a ka\u017ed\u00fd, kto chce, sa k nim m\u00f4\u017ee pripoji\u0165 a posiela\u0165 spr\u00e1vy, a taktie\u017e sa po\u0161tov\u00e9 servery \u0161iroko pou\u017e\u00edvaj\u00fa r\u00f4znymi spolo\u010dnos\u0165ami na v\u00fdmenu d\u00f4le\u017eit\u00fdch \u00fadajov, je to dos\u0165 v\u00fdhodn\u00e1 priehradka pre \u00fato\u010dn\u00edkov, najm\u00e4 pre spamerov. Preto modern\u00e9 po\u0161tov\u00e9 servery obsahuj\u00fa mno\u017estvo \u010fal\u0161\u00edch opatren\u00ed na overenie odosielate\u013ea, kontrolu na spam at\u010f. A mnoh\u00e9 z t\u00fdchto t\u00e9m sa pok\u00fasim rozvin\u00fa\u0165 v nasleduj\u00facich \u010dastiach.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/494788\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042d\u0442\u043e \u043d\u0430\u0447\u0430\u043b\u043e \u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u043a\u0443\u0440\u0441\u0430 \u043f\u0440\u043e \u0440\u0430\u0431\u043e\u0442\u0443 \u043f\u043e\u0447\u0442\u043e\u0432\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432. \u042f \u043d\u0435 \u043f\u0440\u0435\u0441\u043b\u0435\u0434\u0443\u044e \u0446\u0435\u043b\u0438 \u0431\u044b\u0441\u0442\u0440\u043e \u043d\u0430\u0443\u0447\u0438\u0442\u044c \u043a\u043e\u0433\u043e-\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441 \u043f\u043e\u0447\u0442\u043e\u0432\u044b\u043c\u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438. \u0422\u0443\u0442 \u0431\u0443\u0434\u0435\u0442 \u043c\u043d\u043e\u0433\u043e \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u043a\u0430\u0441\u0430\u044e\u0449\u0430\u044f\u0441\u044f \u0442\u0435\u0445 \u0432\u043e\u043f\u0440\u043e\u0441\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u044b \u0431\u0443\u0434\u0435\u043c \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u0442\u044c \u043f\u043e \u043f\u0443\u0442\u0438, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u044f \u0441\u0442\u0430\u0440\u0430\u044e\u0441\u044c \u0434\u0435\u043b\u0430\u0442\u044c \u043a\u0443\u0440\u0441 \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0434\u043b\u044f \u0442\u0435\u0445, \u043a\u0442\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u0435\u043b\u0430\u0435\u0442 \u043f\u0435\u0440\u0432\u044b\u0435 \u0448\u0430\u0433\u0438. \u041f\u0440\u0435\u0434\u0438\u0441\u043b\u043e\u0432\u0438\u0435\u0422\u0430\u043a \u0443\u0436 \u0441\u043b\u043e\u0436\u0438\u043b\u043e\u0441\u044c, \u0447\u0442\u043e \u043f\u043e\u0434\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u044e \u043f\u0440\u0435\u043f\u043e\u0434\u0430\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u043f\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":76170,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-76169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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