{"id":133,"date":"2017-04-06T17:51:11","date_gmt":"2017-04-06T17:51:11","guid":{"rendered":"https:\/\/www.smtp-server.net\/?p=133"},"modified":"2017-03-28T08:11:27","modified_gmt":"2017-03-28T08:11:27","slug":"verejny-smtp-server-bez-overovani-s-vyuzitim-sluzby-maskovani-smtp-k-ochrane-vaseho-postovniho-serveru","status":"publish","type":"post","link":"https:\/\/www.smtp-server.net\/cs\/verejny-smtp-server-bez-overovani-s-vyuzitim-sluzby-maskovani-smtp-k-ochrane-vaseho-postovniho-serveru\/","title":{"rendered":"Ve\u0159ejn\u00fd server SMTP bez ov\u011b\u0159ov\u00e1n\u00ed - Pou\u017eit\u00ed slu\u017eby SMTP Cloaking k ochran\u011b po\u0161tovn\u00edho serveru"},"content":{"rendered":"<p>Protokol SMTP (Simple Mail Transport Protocol) je z\u00e1kladn\u00ed technologi\u00ed, kter\u00e1 slou\u017e\u00ed jako z\u00e1klad pro doru\u010dov\u00e1n\u00ed e-mail\u016f. Zjednodu\u0161en\u011b \u0159e\u010deno je to jazyk, kter\u00fd po\u0161tovn\u00ed servery pou\u017e\u00edvaj\u00ed ke vz\u00e1jemn\u00e9 komunikaci a k pohybu e-mailov\u00fdch zpr\u00e1v po internetu.<\/p>\n<p><!--more--><\/p>\n<p>Podle Wikipedie tvo\u0159\u00ed spam 78% v\u0161ech odeslan\u00fdch e-mailov\u00fdch zpr\u00e1v. V d\u016fsledku toho se mus\u00ed po\u0161tovn\u00ed servery neust\u00e1le vyv\u00edjet, aby se sna\u017eily udr\u017eet si n\u00e1skok.<\/p>\n<p>Pokud provozujete vlastn\u00ed po\u0161tovn\u00ed server, m\u016f\u017eete \u010delit \u0159ad\u011b potenci\u00e1ln\u00edch rizik:<\/p>\n<ul>\n<li>Nadm\u011brn\u00e9 pokusy o doru\u010den\u00ed e-mailov\u00fdch zpr\u00e1v ze strany spammer\u016f nebo jin\u00fdch neopr\u00e1vn\u011bn\u00fdch u\u017eivatel\u016f by mohly na va\u0161em po\u0161tovn\u00edm serveru spot\u0159ebov\u00e1vat zna\u010dn\u00e9 mno\u017estv\u00ed \u0161\u00ed\u0159ky p\u00e1sma a v\u00fdpo\u010detn\u00edho v\u00fdkonu.<\/li>\n<li>Jak\u00e9koli bezpe\u010dnostn\u00ed probl\u00e9my s va\u0161\u00edm po\u0161tovn\u00edm serverov\u00fdm softwarem (nap\u0159\u00edklad p\u0159ete\u010den\u00ed vyrovn\u00e1vac\u00ed pam\u011bti nebo zranitelnosti umo\u017e\u0148uj\u00edc\u00ed vkl\u00e1d\u00e1n\u00ed k\u00f3du) by mohly ohrozit integritu cel\u00e9ho va\u0161eho po\u0161tovn\u00edho syst\u00e9mu.<\/li>\n<li>Pokud je v\u00e1\u0161 server hostov\u00e1n na \u0161irokop\u00e1smov\u00e9m p\u0159ipojen\u00ed typu kabel nebo DSL, existuje mo\u017enost, \u017ee v\u00e1\u0161 poskytovatel internetov\u00fdch slu\u017eeb (ISP) zablokuje port 25 (SMTP port) ve snaze zabr\u00e1nit spammer\u016fm ve vyu\u017e\u00edv\u00e1n\u00ed jeho s\u00edt\u011b. V takov\u00e9m p\u0159\u00edpad\u011b by v\u00e1\u0161 server p\u0159estal fungovat, proto\u017ee byste ji\u017e nemohli p\u0159ij\u00edmat e-maily.<\/li>\n<\/ul>\n<p>Slu\u017eba maskov\u00e1n\u00ed SMTP funguje tak, \u017ee p\u0159ed v\u00e1\u0161 vlastn\u00ed po\u0161tovn\u00ed server um\u00edst\u00ed jeden nebo v\u00edce ve\u0159ejn\u011b p\u0159\u00edstupn\u00fdch SMTP server\u016f. Tyto ve\u0159ejn\u00e9 servery p\u0159ij\u00edmaj\u00ed ve\u0161kerou po\u0161tu ur\u010denou pro va\u0161i dom\u00e9nu, prov\u00e1d\u011bj\u00ed nezbytn\u00e9 antispamov\u00e9 a antivirov\u00e9 kontroly a po\u0161tu p\u0159edaj\u00ed va\u0161emu vlastn\u00edmu po\u0161tovn\u00edmu serveru pouze v p\u0159\u00edpad\u011b, \u017ee se zpr\u00e1va jev\u00ed jako v po\u0159\u00e1dku.<\/p>\n<p>Toto uspo\u0159\u00e1d\u00e1n\u00ed p\u0159in\u00e1\u0161\u00ed n\u011bkolik v\u00fdznamn\u00fdch v\u00fdhod:<\/p>\n<ul>\n<li>Vn\u011bj\u0161\u00ed sv\u011bt nem\u00e1 p\u0159\u00edm\u00fd p\u0159\u00edstup k va\u0161emu po\u0161tovn\u00edmu serveru \u2013 ani nev\u00ed, jak\u00fd po\u0161tovn\u00ed serverov\u00fd software pou\u017e\u00edv\u00e1te.<\/li>\n<li>Va\u0161e \u0161\u00ed\u0159ka p\u00e1sma je omezena, proto\u017ee na v\u00e1\u0161 server budou doru\u010deny pouze ty zpr\u00e1vy, kter\u00e9 pro\u0161ly testy definovan\u00fdmi ve\u0159ejn\u00fdmi servery.<\/li>\n<li>Po\u0161tovn\u00ed server m\u016f\u017eete provozovat na jin\u00e9m portu ne\u017e 25 \u2013 to je ide\u00e1ln\u00ed \u0159e\u0161en\u00ed, pokud v\u00e1\u0161 poskytovatel internetov\u00e9ho p\u0159ipojen\u00ed pat\u0159\u00ed mezi ty, kte\u0159\u00ed blokuj\u00ed p\u0159ipojen\u00ed na portu 25.<\/li>\n<li>Kvalitn\u00ed slu\u017eba maskov\u00e1n\u00ed SMTP nab\u00edz\u00ed n\u011bkolik ve\u0159ejn\u00fdch SMTP server\u016f, co\u017e v\u00e1m zajist\u00ed dodate\u010dnou redundanci pro p\u0159\u00edpad, \u017ee by jeden z jejich server\u016f p\u0159estal fungovat.<\/li>\n<li>Pokud v\u00e1\u0161 vlastn\u00ed server z jak\u00e9hokoli d\u016fvodu p\u0159estane fungovat, budou e-maily zadr\u017eeny na ve\u0159ejn\u00fdch SMTP serverech a automaticky doru\u010deny na v\u00e1\u0161 vlastn\u00ed server, jakmile bude op\u011bt v provozu \u2013 t\u00edm v\u00e1m v podstat\u011b poskytuj\u00ed z\u00e1lo\u017en\u00ed syst\u00e9m pro e-maily a zaji\u0161\u0165uj\u00ed, \u017ee nikdy nep\u0159ijdete o \u017e\u00e1dn\u00e9 e-maily v d\u016fsledku probl\u00e9m\u016f s va\u0161\u00edm vlastn\u00edm po\u0161tovn\u00edm serverem.<\/li>\n<\/ul>\n<p>Pou\u017e\u00edv\u00e1n\u00ed slu\u017eby maskov\u00e1n\u00ed SMTP m\u00e1 jednu potenci\u00e1ln\u011b v\u00fdznamnou nev\u00fdhodu:<\/p>\n<p>Pokud slu\u017eba maskov\u00e1n\u00ed nem\u00e1 k dispozici seznam v\u0161ech platn\u00fdch u\u017eivatel\u016f ve va\u0161\u00ed dom\u00e9n\u011b, bude muset p\u0159epos\u00edlat ka\u017edou p\u0159ijatou zpr\u00e1vu na v\u00e1\u0161 server \u2013 bez ohledu na to, zda p\u0159\u00edjemce existuje, \u010di nikoli. N\u011bkter\u00e9 slu\u017eby maskov\u00e1n\u00ed SMTP v\u00e1m umo\u017en\u00ed poskytnout platn\u00fd seznam e-mailov\u00fdch schr\u00e1nek ve va\u0161\u00ed dom\u00e9n\u011b \u2013 to se rozhodn\u011b vyplat\u00ed, proto\u017ee to umo\u017e\u0148uje ve\u0159ejn\u00fdm server\u016fm odm\u00edtnout jakoukoli po\u0161tu zaslanou neexistuj\u00edc\u00edm p\u0159\u00edjemc\u016fm. Budete v\u0161ak muset zv\u00e1\u017eit, jak budete tento seznam aktualizovat poka\u017ed\u00e9, kdy\u017e na sv\u016fj po\u0161tovn\u00ed server p\u0159id\u00e1te nov\u00e9ho u\u017eivatele \u2013 to je pravd\u011bpodobn\u011b nejlep\u0161\u00ed projednat s va\u0161\u00edm poskytovatelem slu\u017eby maskov\u00e1n\u00ed SMTP, proto\u017ee postup se u jednotliv\u00fdch poskytovatel\u016f li\u0161\u00ed.<\/p>\n<p><b>V\u00fdb\u011br poskytovatele slu\u017eby maskov\u00e1n\u00ed SMTP<\/b><\/p>\n<ul>\n<li>M\u011bli byste po\u010d\u00edtat s ro\u010dn\u00edmi n\u00e1klady v rozmez\u00ed 40\u201360 liber ($55\u2013$85 USD) za dom\u00e9nu, v z\u00e1vislosti na nab\u00edzen\u00fdch funkc\u00edch a poskytovan\u00e9 podpo\u0159e. N\u011bkter\u00e9 spole\u010dnosti mohou \u00fa\u010dtovat vy\u0161\u0161\u00ed poplatky za pr\u00e9miovou \u00farove\u0148 podpory nebo za dopl\u0148kov\u00e9 funkce.<\/li>\n<li>D\u00e1vejte pozor na omezen\u00ed objemu e-mailov\u00e9ho provozu a na to, zda v\u00e1m budou \u00fa\u010dtov\u00e1ny n\u011bjak\u00e9 dodate\u010dn\u00e9 poplatky za nadm\u011brn\u00fd objem e-mail\u016f nebo za vyu\u017eit\u00ed \u0161\u00ed\u0159ky p\u00e1sma.<\/li>\n<li>Umo\u017e\u0148uje tato slu\u017eba zadat seznam platn\u00fdch po\u0161tovn\u00edch schr\u00e1nek ve va\u0161\u00ed dom\u00e9n\u011b? A pokud ano, jak \u010dasto lze tento seznam aktualizovat?<\/li>\n<li>Zahrnuje tato slu\u017eba n\u011bjak\u00e1 opat\u0159en\u00ed proti spamu nebo vir\u016fm? A\u010dkoli \u0159e\u0161en\u00ed proti spamu mohou pomoci omezit mno\u017estv\u00ed spamu, ta, kter\u00e1 jsou p\u0159\u00edli\u0161 citliv\u00e1, by mohla nev\u011bdomky blokovat legitimn\u00ed e-maily.<\/li>\n<\/ul>\n<p>Pokud m\u00e1te n\u011bjak\u00e9 dotazy, na kter\u00e9 tento \u010dl\u00e1nek neodpov\u00edd\u00e1, doporu\u010duji v\u00e1m obr\u00e1tit se na n\u011bkolik r\u016fzn\u00fdch poskytovatel\u016f slu\u017eeb maskov\u00e1n\u00ed SMTP a prodiskutovat s nimi va\u0161e konkr\u00e9tn\u00ed po\u017eadavky. Pot\u0159eby ka\u017ed\u00e9ho jsou jin\u00e9 a potenci\u00e1ln\u00ed v\u00fdhody, kter\u00e9 v\u00e1m slu\u017eba maskov\u00e1n\u00ed SMTP m\u016f\u017ee p\u0159in\u00e9st, budou z\u00e1viset na va\u0161ich individu\u00e1ln\u00edch okolnostech.<\/p>","protected":false},"excerpt":{"rendered":"<p>Protokol SMTP (Simple Mail Transport Protocol) je z\u00e1kladn\u00ed technologi\u00ed, kter\u00e1 slou\u017e\u00ed jako z\u00e1klad pro doru\u010dov\u00e1n\u00ed e-mail\u016f. Zjednodu\u0161en\u011b \u0159e\u010deno je to jazyk, kter\u00fd po\u0161tovn\u00ed servery pou\u017e\u00edvaj\u00ed ke vz\u00e1jemn\u00e9 komunikaci a k pohybu e-mailov\u00fdch zpr\u00e1v po internetu.<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-133","post","type-post","status-publish","format-standard","hentry","category-smtp-servers"],"_links":{"self":[{"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/posts\/133","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/comments?post=133"}],"version-history":[{"count":1,"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/posts\/133\/revisions"}],"predecessor-version":[{"id":134,"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/posts\/133\/revisions\/134"}],"wp:attachment":[{"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/media?parent=133"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/categories?post=133"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.smtp-server.net\/cs\/wp-json\/wp\/v2\/tags?post=133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}