{"id":4344,"date":"2024-04-22T20:55:17","date_gmt":"2024-04-22T17:55:17","guid":{"rendered":"https:\/\/uzmanposta.com\/blog\/?p=4344"},"modified":"2024-04-22T20:55:19","modified_gmt":"2024-04-22T17:55:19","slug":"etrn","status":"publish","type":"post","link":"https:\/\/uzmanposta.com\/blog\/etrn\/","title":{"rendered":"ETRN Nedir? Mail G\u00fcvenlik Paketlerinde ETRN Hizmeti Hakk\u0131nda Her \u015eey"},"content":{"rendered":"\n<p>E-posta pazarlamac\u0131lar, g\u00fcnl\u00fck olarak y\u00fcksek miktarda giden e-posta g\u00f6nderir. Simple Mail Transfer Protocol\u2019\u00fcn (SMTP) nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve bir SMTP diyalo\u011fu boyunca nelerin ger\u00e7ekle\u015fti\u011fini anlamak, bu s\u00fcre\u00e7 boyunca ortaya \u00e7\u0131kan yayg\u0131n sorunlar\u0131 \u00e7\u00f6zmek i\u00e7in \u00f6nemlidir.<\/p>\n\n\n\n<p>Bu ama\u00e7la, en yayg\u0131n kullan\u0131lan <a href=\"https:\/\/uzmanposta.com\/blog\/smtp-nedir\/\">SMTP<\/a> komutlar\u0131ndan biri olan ETRN ile ilgili t\u00fcm detaylar\u0131 bilmek de son derece faydal\u0131d\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SMTP (Simple Mail Transfer Protocol) Nedir?<\/h2>\n\n\n\n<p>SMTP veya Simple Mail Transfer Protocol, e-posta istemcilerinin mesaj al\u0131\u015fveri\u015fini ger\u00e7ekle\u015ftirdi\u011fi standart bir y\u00f6ntemdir. Di\u011fer protokollerde oldu\u011fu gibi SMTP de e-posta istemcilerindeki \u00e7e\u015fitli hesaplar aras\u0131nda bilgi al\u0131\u015fveri\u015fine izin veren bir dizi kural i\u00e7erir.<\/p>\n\n\n\n<p>SMTP d\u00fcnya \u00e7ap\u0131nda en yayg\u0131n kullan\u0131lan protokollerden biridir. Asl\u0131nda, SMTP sunucular aras\u0131nda e-posta g\u00f6ndermek i\u00e7in kullan\u0131lan tek \u00f6zel protokold\u00fcr ve Outlook ve Gmail gibi d\u00fcnyan\u0131n en pop\u00fcler e-posta istemcilerinin \u00e7o\u011fu SMTP kullan\u0131r.<\/p>\n\n\n\n<p>Bu nedenle, e-posta pazarlamac\u0131lar\u0131n\u0131n SMTP ve SMTP aktar\u0131c\u0131lar\u0131n\u0131n amac\u0131 ve i\u015flevleri hakk\u0131nda g\u00fc\u00e7l\u00fc bir anlay\u0131\u015fa sahip olmalar\u0131 gerekir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Geni\u015fletilmi\u015f SMTP komutlar\u0131<\/h2>\n\n\n\n<p>Extended Simple Mail Transfer Protocol veya ESMTP, sunucular\u0131n korunmas\u0131na yard\u0131mc\u0131 olmak i\u00e7in daha y\u00fcksek d\u00fczeyde i\u015flevsellik ve g\u00fcvenlik sa\u011flamay\u0131 ama\u00e7layan SMTP&#8217;nin bir uzant\u0131s\u0131d\u0131r.<\/p>\n\n\n\n<p>ESMTP, SSL \u015fifreleme, multimedya dosya ekleme ve g\u00f6nderenin kimlik do\u011frulamas\u0131n\u0131 i\u00e7eren \u00e7ok \u00e7e\u015fitli kullan\u0131\u015fl\u0131 \u00f6zelliklere sahiptir.<\/p>\n\n\n\n<p>A\u015fa\u011f\u0131da en yayg\u0131n olanlar geni\u015fletilmi\u015f SMPT komutlar\u0131ndan baz\u0131lar\u0131 verilmi\u015ftir:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. STARTTLS<\/h3>\n\n\n\n<p>\u0130stemci, sunucu ile bir TLS (Transport Layer Security) el s\u0131k\u0131\u015fmas\u0131 ba\u015flatmak i\u00e7in STARTTLS komutunu verir. Bu, iki taraf aras\u0131nda g\u00fcvenli bir SMTP oturumu ba\u015flat\u0131r.<\/p>\n\n\n\n<p>Yan\u0131t olarak sunucu 2220 kodu g\u00f6ndererek SMTP diyalo\u011funa ba\u015flamaya haz\u0131r oldu\u011funu bildirir. Bundan sonra, istemci SMTP g\u00f6r\u00fc\u015fmesini normal \u015fekilde ba\u015flatmak i\u00e7in HELO veya EHLO komutuyla devam edecektir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. AUTH<\/h3>\n\n\n\n<p>AUTH komutunun amac\u0131, SMTP sunucusundaki istemcinin kimli\u011fini do\u011frulamakt\u0131r. Bu, istemcinin sunucu \u00fczerinde belirli ayr\u0131cal\u0131klardan yararlanmas\u0131n\u0131 sa\u011flar. AUTH komutu, g\u00fcvenlik d\u00fczeyleri ve oturum a\u00e7ma y\u00f6ntemleriyle ilgili \u00f6zellikler sa\u011flayan d\u00f6rt anahtar s\u00f6zc\u00fckten birini i\u00e7erebilir: LOGIN, PLAIN, MD5 ve CRAM-MD5.<\/p>\n\n\n\n<p>Bu komutun ard\u0131ndan bir kullan\u0131c\u0131 ad\u0131 ve \u015fifre talebi gelir. Do\u011fru bilgiler sa\u011fland\u0131\u011f\u0131nda ve sunucu olumlu yan\u0131t verdi\u011finde, SMTP oturumunun kimli\u011fi do\u011frulanm\u0131\u015f kabul edilir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. BDAT<\/h3>\n\n\n\n<p>BDAT komutu, ayn\u0131 zamanda e-posta verilerini aktarmak i\u00e7in bir istek oldu\u011fundan, DATA komutunun geni\u015fletilmi\u015f bir alternatifi olarak d\u00fc\u015f\u00fcn\u00fclebilir.<\/p>\n\n\n\n<p>\u00d6zellikle, BDAT komutu, ses, video, g\u00f6r\u00fcnt\u00fc veya uygulamalar gibi \u00e7e\u015fitli veri t\u00fcrlerini i\u00e7erebilen b\u00fcy\u00fck MIME (Multipurpose Internet Mail Extensions) iletilerinin aktar\u0131m\u0131 i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. ETRN<\/h3>\n\n\n\n<p>ETRN veya &#8220;Extended Turn&#8221; komutu geni\u015fletilmi\u015f bir SMTP komutudur. ETRN komutunun amac\u0131, SMTP istemcisinin bir sunucuya sahip olabilece\u011fi t\u00fcm postalar\u0131 g\u00f6ndermesini emretmesini sa\u011flamakt\u0131r.<\/p>\n\n\n\n<p>Komut kabul edildi\u011finde, sunucu 250 OK koduyla yan\u0131t verir ve bu noktada mesaj kuyruklar\u0131n\u0131 i\u015flemeye ba\u015flar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ETRN Nedir?<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir-1024x576.jpeg\" alt=\"\" class=\"wp-image-4347\" srcset=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir-1024x576.jpeg 1024w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir-300x169.jpeg 300w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir-768x432.jpeg 768w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir-750x422.jpeg 750w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir-1140x641.jpeg 1140w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir.jpeg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p>ETRN (Extended Turn), bir SMTP sunucusunun sahip oldu\u011fu e-posta iletilerini g\u00f6ndermek i\u00e7in ba\u015fka bir SMTP sunucusuna istek g\u00f6ndermesine olanak tan\u0131yan Simple Mail Transfer Protocol&#8217;\u00fcn (SMTP) bir uzant\u0131s\u0131d\u0131r. Temel olarak bu sadece alan ad\u0131 ile birlikte ETRN komutunun verilmesini i\u00e7erir.&nbsp;<\/p>\n\n\n\n<p>ETRN 25 numaral\u0131 SMTP ba\u011flant\u0131 noktas\u0131n\u0131 kullan\u0131r. Yerel \u0130SS&#8217;niz gelen ba\u011flant\u0131 noktas\u0131 25 ba\u011flant\u0131lar\u0131n\u0131 engelliyorsa, Posta Y\u00f6neticisini kullanarak e-postan\u0131z\u0131 d\u00f6nd\u00fcrmek i\u00e7in \u00f6zel bir ba\u011flant\u0131 noktas\u0131 ayarlayabilir veya ba\u011flant\u0131 noktas\u0131 366&#8217;y\u0131 kullanan ATRN protokol\u00fcn\u00fc kullanabilirsiniz.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ETRN Nas\u0131l \u00c7al\u0131\u015f\u0131r ve Nas\u0131l Kullan\u0131labilir?<\/h2>\n\n\n\n<p>ETRN&#8217;yi kullanman\u0131n genel prensibi, ba\u011flant\u0131 ve kullan\u0131labilirlik a\u00e7\u0131s\u0131ndan \u015f\u00fcpheli g\u00fcvenilirli\u011fe sahip olabilecek bir birincil posta sunucusunun oldu\u011fu bir senaryodur. <\/p>\n\n\n\n<p>Bir alan ad\u0131n\u0131n en az 2 MX kayd\u0131 olmas\u0131 \u00f6nerilir ve ikincil kay\u0131t basit bir yedek posta sunucusu olabilir. Bunun sa\u011flad\u0131\u011f\u0131 avantaj, birincil e-posta sunucunuz \u00e7evrimd\u0131\u015f\u0131 olsa bile, postan\u0131n teslimat\u0131 deneyen herhangi bir internet ana bilgisayar\u0131ndan g\u00fcvenli bir \u015fekilde ba\u011flanmas\u0131 ve bu ertelenmi\u015f e-posta\u2019n\u0131n daha sonra toplanabilmesidir. Bu senaryodaki ikincil yedek sunucu, alan ad\u0131 i\u00e7in t\u00fcm e-posta\u2019lar\u0131 toplayacak, ancak kal\u0131c\u0131 olarak s\u0131raya koyacak \u015fekilde yap\u0131land\u0131r\u0131lacakt\u0131r. \u00d6rne\u011fin, an\u0131nda ileriye do\u011fru teslimat\u0131 denemeyecektir. Bu arada, birincil sunucu yedek sunucuyu kuyruktan \u00e7\u0131karacak \u015fekilde yap\u0131land\u0131r\u0131l\u0131r. <\/p>\n\n\n\n<p>ETRN komutu s\u0131ray\u0131 kald\u0131rmak i\u00e7in kullan\u0131lan komuttur. Bir de-queue komutu yedek sunucu taraf\u0131ndan do\u011fruland\u0131\u011f\u0131nda ve i\u015flendi\u011finde, yedek sunucu o alan ad\u0131 i\u00e7in mesajlar\u0131 belirtilen bir ana bilgisayara, yani birincil sunucuya g\u00f6nderecektir. Birincil sunucuya g\u00f6re, normalde yapt\u0131\u011f\u0131 gibi internetten gelen yeni mesajlar\u0131 g\u00f6zlemler.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ETRN ve G\u00fcvenlik<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. TLS ve SSL deste\u011fi<\/h3>\n\n\n\n<p>Sunucu, STARTTLS komutu arac\u0131l\u0131\u011f\u0131yla <a href=\"https:\/\/uzmanposta.com\/blog\/tls\/\">TLS<\/a> v1.0&#8217;\u0131 destekler (25 numaral\u0131 ba\u011flant\u0131 noktas\u0131ndaki normal d\u00fcz metin SMTP protokol\u00fc arac\u0131l\u0131\u011f\u0131yla) ve ayr\u0131ca 465 numaral\u0131 ba\u011flant\u0131 noktas\u0131 arac\u0131l\u0131\u011f\u0131yla SSL \u00fczerinden SMTP \u00fczerinden ba\u011flant\u0131lar\u0131 kabul eder. Bu y\u00f6ntemlerden herhangi birinin kullan\u0131lmas\u0131 ETRN talebinin ve kimlik do\u011frulamas\u0131n\u0131n g\u00fcvenli bir \u015fekilde iletilmesini sa\u011flayacakt\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Kullan\u0131c\u0131 kimlik do\u011frulamas\u0131<\/h3>\n\n\n\n<p>Sunucu, kimlik do\u011frulama protokol\u00fc olarak PLAIN veya CRAMMD5 kullanarak herhangi bir iste\u011fi kabul etmeden \u00f6nce sunucuya ge\u00e7erli bir kullan\u0131c\u0131 ad\u0131 ve parola g\u00f6nderilmesini gerektirir. Yap\u0131land\u0131r\u0131lmakta olan sunucu destekliyorsa CRAMMD5 kullan\u0131lmas\u0131 \u00f6nerilir. Kimlik do\u011frulaman\u0131n devam edebilmesi i\u00e7in SSL veya STARTLS arac\u0131l\u0131\u011f\u0131yla g\u00fcvenli bir ba\u011flant\u0131 kurulmas\u0131 gerekti\u011fini unutmaman\u0131z \u00f6nemlidir. Hemen hemen t\u00fcm modern e-posta sunucusu yaz\u0131l\u0131mlar\u0131, kullan\u0131c\u0131 ad\u0131 ve parola ile doldurulabilen bir TLS anla\u015fma alan\u0131na sahiptir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. DNS ve hedef ana bilgisayar g\u00fcvenli\u011fi<\/h3>\n\n\n\n<p>Sunucu, bir alan ad\u0131na y\u00f6nelik postalar\u0131 yaln\u0131zca belirli bir ana bilgisayar ad\u0131na (ana bilgisayar ad\u0131 veya birincil posta sunucunuz) g\u00f6nderilecek \u015fekilde yap\u0131land\u0131r\u0131lacakt\u0131r. Bu, genel <a href=\"https:\/\/uzmanposta.com\/blog\/dns-nedir-dns-ayarlari-degistirme\/\">DNS<\/a> bilgilerine y\u00f6nelik olas\u0131 sald\u0131r\u0131lar\u0131n e-postan\u0131z\u0131n yanl\u0131\u015fl\u0131kla 3. taraf bir ana bilgisayara y\u00f6nlendirilmesine neden olmas\u0131n\u0131 \u00f6nlemek i\u00e7in sunucuda sabit olarak yap\u0131land\u0131r\u0131lm\u0131\u015ft\u0131r.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>E-posta pazarlamac\u0131lar, g\u00fcnl\u00fck olarak y\u00fcksek miktarda giden e-posta g\u00f6nderir. Simple Mail Transfer Protocol\u2019\u00fcn (SMTP) nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve bir SMTP diyalo\u011fu boyunca nelerin ger\u00e7ekle\u015fti\u011fini anlamak, bu s\u00fcre\u00e7 boyunca ortaya \u00e7\u0131kan yayg\u0131n sorunlar\u0131 \u00e7\u00f6zmek i\u00e7in \u00f6nemlidir. Bu ama\u00e7la, en yayg\u0131n kullan\u0131lan SMTP komutlar\u0131ndan biri olan ETRN ile ilgili t\u00fcm detaylar\u0131 bilmek de son derece faydal\u0131d\u0131r. SMTP (Simple [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4345,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-4344","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guvenlik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ETRN Nedir? Mail G\u00fcvenlik Paketlerinde ETRN Hizmeti Hakk\u0131nda Her \u015eey - Uzman Posta<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uzmanposta.com\/blog\/etrn\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ETRN Nedir? Mail G\u00fcvenlik Paketlerinde ETRN Hizmeti Hakk\u0131nda Her \u015eey - Uzman Posta\" \/>\n<meta property=\"og:description\" content=\"E-posta pazarlamac\u0131lar, g\u00fcnl\u00fck olarak y\u00fcksek miktarda giden e-posta g\u00f6nderir. Simple Mail Transfer Protocol\u2019\u00fcn (SMTP) nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve bir SMTP diyalo\u011fu boyunca nelerin ger\u00e7ekle\u015fti\u011fini anlamak, bu s\u00fcre\u00e7 boyunca ortaya \u00e7\u0131kan yayg\u0131n sorunlar\u0131 \u00e7\u00f6zmek i\u00e7in \u00f6nemlidir. Bu ama\u00e7la, en yayg\u0131n kullan\u0131lan SMTP komutlar\u0131ndan biri olan ETRN ile ilgili t\u00fcm detaylar\u0131 bilmek de son derece faydal\u0131d\u0131r. SMTP (Simple [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uzmanposta.com\/blog\/etrn\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/uzmanposta\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-22T17:55:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-22T17:55:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2024\/04\/etrn-nedir-mail-guvenlik-paketlerinde-etrn-hizmeti-hakkinda-her-sey.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sibel Ho\u015f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@uZmanPosta\" \/>\n<meta name=\"twitter:site\" content=\"@uZmanPosta\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sibel Ho\u015f\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 dakika\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"ETRN Nedir? Mail G\u00fcvenlik Paketlerinde ETRN Hizmeti Hakk\u0131nda Her \u015eey - Uzman Posta","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/uzmanposta.com\/blog\/etrn\/","og_locale":"tr_TR","og_type":"article","og_title":"ETRN Nedir? Mail G\u00fcvenlik Paketlerinde ETRN Hizmeti Hakk\u0131nda Her \u015eey - Uzman Posta","og_description":"E-posta pazarlamac\u0131lar, g\u00fcnl\u00fck olarak y\u00fcksek miktarda giden e-posta g\u00f6nderir. Simple Mail Transfer Protocol\u2019\u00fcn (SMTP) nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve bir SMTP diyalo\u011fu boyunca nelerin ger\u00e7ekle\u015fti\u011fini anlamak, bu s\u00fcre\u00e7 boyunca ortaya \u00e7\u0131kan yayg\u0131n sorunlar\u0131 \u00e7\u00f6zmek i\u00e7in \u00f6nemlidir. Bu ama\u00e7la, en yayg\u0131n kullan\u0131lan SMTP komutlar\u0131ndan biri olan ETRN ile ilgili t\u00fcm detaylar\u0131 bilmek de son derece faydal\u0131d\u0131r. 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