{"id":588,"date":"2025-09-10T16:16:02","date_gmt":"2025-09-10T13:16:02","guid":{"rendered":"https:\/\/destek.narhost.com\/?p=588"},"modified":"2026-09-14T23:05:26","modified_gmt":"2026-09-14T20:05:26","slug":"postfix-552-5-3-4-message-size-exceeds-fixed-limit-hatasi-nasil-cozulur","status":"publish","type":"post","link":"https:\/\/narhost.com\/destek\/postfix-552-5-3-4-message-size-exceeds-fixed-limit-hatasi-nasil-cozulur\/","title":{"rendered":"Postfix 552 5.3.4 Message Size Exceeds Fixed Limit Hatas\u0131 Nas\u0131l \u00c7\u00f6z\u00fcl\u00fcr"},"content":{"rendered":"<p class=\"kb-dogrulama\">Son g\u00f6zden ge\u00e7irme: Eyl\u00fcl 2026 \u00b7 Postfix (Ubuntu 24.04 ve AlmaLinux 9) resm\u00ee dok\u00fcman\u0131na g\u00f6re<\/p>\n<div id=\"hizli-cozum\" class=\"ai-box ai-box--cozum\">\n<p class=\"ai-box-title\">H\u0131zl\u0131 \u00e7\u00f6z\u00fcm<\/p>\n<p><strong>Postfix 552 message size exceeds fixed limit<\/strong> hatas\u0131, g\u00f6nderilen e-postan\u0131n boyutunun Postfix&#8217;te tan\u0131ml\u0131 \u00fcst s\u0131n\u0131r\u0131 (<code>message_size_limit<\/code>) a\u015fmas\u0131 y\u00fcz\u00fcnden \u00e7\u0131kar; \u00e7\u00f6z\u00fcm, sunucunuzda bu s\u0131n\u0131r\u0131 ihtiyac\u0131n\u0131za g\u00f6re b\u00fcy\u00fct\u00fcp yap\u0131land\u0131rmay\u0131 yeniden y\u00fcklemektir.<\/p>\n<ol>\n<li><code>postconf message_size_limit<\/code> ile sunucudaki mevcut s\u0131n\u0131r\u0131 byte cinsinden okuyun.<\/li>\n<li><code>\/etc\/postfix\/main.cf<\/code> i\u00e7inde <code>message_size_limit<\/code> de\u011ferini yeni s\u0131n\u0131ra ayarlay\u0131n.<\/li>\n<li><code>postfix reload<\/code> ile yap\u0131land\u0131rmay\u0131 yeniden y\u00fckleyin.<\/li>\n<li>B\u00fcy\u00fck ekli bir test e-postas\u0131 g\u00f6nderip teslim edildi\u011fini do\u011frulay\u0131n.<\/li>\n<\/ol>\n<\/div>\n<table class=\"kb-uyg\">\n<tr>\n<th>Panel<\/th>\n<td>Yok (kendi mail sunucunuz, komut sat\u0131r\u0131)<\/td>\n<\/tr>\n<tr>\n<th>Sistem<\/th>\n<td>VPS\/VDS \u00fczerinde kurdu\u011funuz Postfix mail sunucusu<\/td>\n<\/tr>\n<tr>\n<th>Yetki<\/th>\n<td><code>root<\/code> ya da <code>sudo<\/code> yetkili kullan\u0131c\u0131<\/td>\n<\/tr>\n<tr>\n<th>Narhost \u00fcr\u00fcn\u00fc<\/th>\n<td><a href=\"https:\/\/narhost.com\/kurumsal-e-posta\" title=\"Kurumsal E-posta - Narhost\">Kurumsal E-posta<\/a><\/td>\n<\/tr>\n<\/table>\n<div class=\"kb-once\">\n<p class=\"label\">Ba\u015flamadan \u00f6nce<\/p>\n<ul>\n<li>Sunucunuza SSH ile ba\u011flanabiliyor ve komutlar\u0131 <code>root<\/code> yetkisiyle \u00e7al\u0131\u015ft\u0131rabiliyor olmal\u0131s\u0131n\u0131z.<\/li>\n<li>S\u0131n\u0131r\u0131 ne kadar y\u00fckseltece\u011finize karar verin; de\u011fer byte cinsindendir (\u00f6r. 25 MB i\u00e7in <code>26214400<\/code>).<\/li>\n<li>Payla\u015f\u0131ml\u0131 hosting kullan\u0131yorsan\u0131z <code>main.cf<\/code> dosyas\u0131na eri\u015femezsiniz; e-posta boyut s\u0131n\u0131r\u0131 sunucu taraf\u0131nda y\u00f6netilir, bunun i\u00e7in <a href=\"https:\/\/narhost.com\/destek\/cpanel-ve-plesk-uzerinde-mail-limitleri-nereden-ayarlanir\/\" title=\"cPanel ve Plesk \u00fczerinde mail limitleri nereden ayarlan\u0131r - Narhost Destek\">panel mail limitleri<\/a> kart\u0131na bak\u0131n.<\/li>\n<\/ul>\n<\/div>\n<h2>Postfix 552 message size exceeds fixed limit hatas\u0131 ne anlama gelir<\/h2>\n<p>G\u00f6nderim s\u0131ras\u0131nda SMTP oturumunda sunucu \u015fu sat\u0131r\u0131 d\u00f6nd\u00fcr\u00fcr: <code>552 5.3.4 Message size exceeds fixed limit<\/code>. Buradaki <code>5<\/code> ile ba\u015flayan geli\u015fmi\u015f durum kodu kal\u0131c\u0131 bir reddi belirtir: ayn\u0131 iletiyi b\u00fcy\u00fctmeden yeniden g\u00f6ndermek i\u015fe yaramaz. Neden nettir; iletinin toplam boyutu (metin, ba\u015fl\u0131klar ve base64 ile kodlanan ekler d\u00e2hil) sunucunun kabul etti\u011fi en b\u00fcy\u00fck ileti boyutunu a\u015fm\u0131\u015ft\u0131r.<\/p>\n<p>Dikkat edilecek nokta, eklerin base64 kodlamas\u0131 y\u00fcz\u00fcnden aktar\u0131mda yakla\u015f\u0131k \u00fc\u00e7te bir b\u00fcy\u00fcmesidir; yani diskte 20 MB g\u00f6r\u00fcnen bir ek, aktar\u0131mda 27 MB&#8217;a yak\u0131n yer kaplar. Bu y\u00fczden s\u0131n\u0131r\u0131 belirlerken kullan\u0131c\u0131lar\u0131n g\u00f6nderdi\u011fi en b\u00fcy\u00fck eki de\u011fil, onun kodlanm\u0131\u015f h\u00e2lini \u00f6l\u00e7\u00fc al\u0131n. S\u0131n\u0131r hem g\u00f6nderen hem alan sunucuda ge\u00e7erlidir; kar\u015f\u0131 taraf k\u00fc\u00e7\u00fck bir s\u0131n\u0131r uyguluyorsa ileti orada da reddedilebilir.<\/p>\n<h2>Ad\u0131m ad\u0131m message_size_limit de\u011ferini art\u0131rma<\/h2>\n<h3>Mevcut s\u0131n\u0131r\u0131 okuyun<\/h3>\n<ol class=\"kb-adimlar\">\n<li>\u00d6nce sunucudaki ge\u00e7erli de\u011feri g\u00f6r\u00fcn. <a href=\"https:\/\/www.postfix.org\/postconf.1.html\" title=\"Postfix postconf(1) resm\u00ee dok\u00fcmantasyonu\" target=\"_blank\" rel=\"noopener\">postconf komutunun resm\u00ee dok\u00fcmantasyonuna<\/a> g\u00f6re parametre ad\u0131n\u0131 vererek tek bir ayar\u0131 okuyabilirsiniz.\n<pre><code class=\"language-bash\"># Ge\u00e7erli message_size_limit de\u011ferini byte cinsinden g\u00f6ster\npostconf message_size_limit<\/code><\/pre>\n<p class=\"kb-cikti\">Beklenen sonu\u00e7: \u00f6rne\u011fin <code>message_size_limit = 10240000<\/code> gibi bir sat\u0131r g\u00f6r\u00fcrs\u00fcn\u00fcz; bu yakla\u015f\u0131k 10 MB&#8217;d\u0131r.<\/p>\n<\/li>\n<\/ol>\n<h3>Yeni s\u0131n\u0131r\u0131 yaz\u0131n<\/h3>\n<ol class=\"kb-adimlar\">\n<li>Yap\u0131land\u0131rma dosyas\u0131n\u0131 a\u00e7\u0131p de\u011feri g\u00fcncelleyin. <a href=\"https:\/\/www.postfix.org\/postconf.5.html\" title=\"Postfix postconf(5) yap\u0131land\u0131rma parametreleri dok\u00fcmantasyonu\" target=\"_blank\" rel=\"noopener\">Postfix parametre dok\u00fcmantasyonuna<\/a> g\u00f6re <code>message_size_limit<\/code> izin verilen en b\u00fcy\u00fck ileti boyutunu byte cinsinden belirler.\n<pre><code class=\"language-bash\"># Yap\u0131land\u0131rma dosyas\u0131n\u0131 d\u00fczenlemek i\u00e7in a\u00e7\u0131n\nnano \/etc\/postfix\/main.cf<\/code><\/pre>\n<p>Dosyaya a\u015fa\u011f\u0131daki sat\u0131r\u0131 ekleyin ya da varsa g\u00fcncelleyin; \u00f6rnek de\u011fer 50 MB&#8217;a kar\u015f\u0131l\u0131k gelir.<\/p>\n<pre><code class=\"language-ini\"># \u0130zin verilen en b\u00fcy\u00fck ileti boyutu (byte) \u2014 50 MB\nmessage_size_limit = 52428800<\/code><\/pre>\n<p class=\"kb-cikti\">Beklenen sonu\u00e7: dosya kaydedildi\u011finde yeni s\u0131n\u0131r tan\u0131mlanm\u0131\u015f olur, ancak hen\u00fcz devrede de\u011fildir.<\/p>\n<\/li>\n<\/ol>\n<div class=\"warn-box\">\n<p class=\"label\">Dikkat<\/p>\n<p>De\u011feri <code>0<\/code> yapmak s\u0131n\u0131r\u0131 tamamen kald\u0131r\u0131r ve sunucunuzu \u00e7ok b\u00fcy\u00fck eklerle k\u00f6t\u00fcye kullan\u0131ma a\u00e7ar; bu \u00f6nerilmez. Ayr\u0131ca posta kutusu deposunda <code>mailbox_size_limit<\/code> ayar\u0131 <code>message_size_limit<\/code> de\u011ferinden k\u00fc\u00e7\u00fckse iletiler yine reddedilebilir, bu iki de\u011feri birlikte de\u011ferlendirin.<\/p>\n<\/div>\n<h3>Yap\u0131land\u0131rmay\u0131 yeniden y\u00fckleyin<\/h3>\n<ol class=\"kb-adimlar\">\n<li>De\u011fi\u015fikli\u011fin devreye girmesi i\u00e7in Postfix&#8217;i yeniden y\u00fckleyin; bu, servisi durdurmadan yap\u0131land\u0131rmay\u0131 tazeler.\n<pre><code class=\"language-bash\"># Yap\u0131land\u0131rmay\u0131 yeniden y\u00fckle\npostfix reload\n# Yeni de\u011ferin okundu\u011funu do\u011frula\npostconf message_size_limit<\/code><\/pre>\n<p class=\"kb-cikti\">Beklenen sonu\u00e7: <code>postconf<\/code> \u00e7\u0131kt\u0131s\u0131 art\u0131k yeni de\u011feri g\u00f6sterir ve b\u00fcy\u00fck iletiler s\u0131n\u0131ra kadar kabul edilir.<\/p>\n<\/li>\n<\/ol>\n<figure class=\"nh-sema\"><img src=\"https:\/\/narhost.com\/destek\/wp-content\/uploads\/2026\/09\/postfix-552-5-3-4-message-size-exceeds-fixed-limit-hatasi-nasil-cozulur-sema-narhost.webp\" alt=\"postfix 552 message size exceeds fixed limit hatas\u0131 \u00e7\u00f6z\u00fcm\u00fcnde message_size_limit de\u011ferini art\u0131r\u0131p reload ak\u0131\u015f\u0131\" width=\"1200\" height=\"500\" loading=\"lazy\" decoding=\"async\"><figcaption>Mevcut s\u0131n\u0131r\u0131 okuyun, main.cf i\u00e7inde de\u011feri b\u00fcy\u00fct\u00fcn, reload edin, b\u00fcy\u00fck ekli test e-postas\u0131yla do\u011frulay\u0131n.<\/figcaption><\/figure>\n<h2>Do\u011frulama<\/h2>\n<div class=\"success-box\">\n<p class=\"label\">Sonu\u00e7<\/p>\n<p>Yeni s\u0131n\u0131r\u0131n alt\u0131nda kalan b\u00fcy\u00fck ekli bir test e-postas\u0131 g\u00f6nderdi\u011finizde ileti reddedilmeden teslim ediliyorsa ve <code>maillog<\/code> sat\u0131r\u0131nda <code>552 5.3.4<\/code> yerine <code>status=sent<\/code> g\u00f6r\u00fcyorsan\u0131z sorun \u00e7\u00f6z\u00fclm\u00fc\u015ft\u00fcr. Kar\u015f\u0131 taraf\u0131n s\u0131n\u0131r\u0131 sizinkinden k\u00fc\u00e7\u00fckse iletinin orada reddedilebilece\u011fini unutmay\u0131n; bu durumda dosyay\u0131 s\u0131k\u0131\u015ft\u0131r\u0131p g\u00f6ndermek ya da bir payla\u015f\u0131m ba\u011flant\u0131s\u0131 kullanmak daha g\u00fcvenlidir.<\/p>\n<\/div>\n<h2>H\u00e2l\u00e2 \u00e7\u00f6z\u00fclmediyse<\/h2>\n<ul>\n<li><strong>552 yerine 452 hatas\u0131 al\u0131yorsunuz.<\/strong> Bu boyut de\u011fil, disk\/inode dolmas\u0131 kaynakl\u0131d\u0131r; <a href=\"https:\/\/narhost.com\/destek\/postfix-out-452-4-3-1-insufficient-system-storage-hatasi-nasil-cozulur\/\" title=\"Postfix 452 Insufficient System Storage hatas\u0131 - Narhost Destek\">Postfix 452 Insufficient System Storage<\/a> kart\u0131na bak\u0131n.<\/li>\n<li><strong>S\u0131n\u0131r\u0131 b\u00fcy\u00fctt\u00fcn\u00fcz ama ileti h\u00e2l\u00e2 reddediliyor.<\/strong> Posta kutusu deposu dolmu\u015f ya da kota a\u015f\u0131lm\u0131\u015f olabilir; <a href=\"https:\/\/narhost.com\/destek\/mailbox-doldugunda-ne-yapilmali\/\" title=\"Mailbox doldu\u011funda ne yap\u0131lmal\u0131 - Narhost Destek\">mailbox doldu\u011funda<\/a> kart\u0131n\u0131 izleyin.<\/li>\n<li><strong>Kuyrukta bekleyen iletiler birikti.<\/strong> Reddedilen b\u00fcy\u00fck iletileri kuyruktan g\u00f6rmek ve y\u00f6netmek i\u00e7in <a href=\"https:\/\/narhost.com\/destek\/postfix-mail-kuyrugu-komutlari\/\" title=\"Postfix mail kuyru\u011fu komutlar\u0131 - Narhost Destek\">Postfix kuyruk komutlar\u0131<\/a> kart\u0131n\u0131 kullan\u0131n.<\/li>\n<li><strong>E-posta hi\u00e7 g\u00f6nderilemiyor.<\/strong> Boyuttan ba\u011f\u0131ms\u0131z genel te\u015fhis i\u00e7in <a href=\"https:\/\/narhost.com\/destek\/mail-gonderilemiyorsa-ne-yapmaliyim\/\" title=\"Mail g\u00f6nderilemiyorsa ne yapmal\u0131y\u0131m - Narhost Destek\">mail g\u00f6nderilemiyorsa<\/a> kart\u0131na bak\u0131n.<\/li>\n<\/ul>\n<div class=\"cta-box\">\n<p class=\"label\">Narhost deste\u011fi<\/p>\n<p>Kendi Postfix sunucunuzun bak\u0131m\u0131n\u0131 \u00fcstlenmek yerine posta altyap\u0131s\u0131n\u0131 haz\u0131r bir \u00e7\u00f6z\u00fcmle y\u00fcr\u00fctmek isterseniz Kurumsal E-posta paketlerimizi de\u011ferlendirebilirsiniz. Destek talebinize sunucu t\u00fcr\u00fcn\u00fc, <code>postconf message_size_limit<\/code> \u00e7\u0131kt\u0131s\u0131n\u0131 ve <code>maillog<\/code> i\u00e7indeki tam hata sat\u0131r\u0131n\u0131 ekleyin.<\/p>\n<p><a class=\"cta-btn\" href=\"https:\/\/narhost.com\/submitticket.php\" title=\"Narhost destek talebi a\u00e7\">Destek talebi a\u00e7<\/a><\/div>\n<div class=\"kb-ilgili\">\n<p class=\"label\">Sonraki ad\u0131mlar<\/p>\n<ul>\n<li><a href=\"https:\/\/narhost.com\/destek\/site-bazen-acilmiyorsa-ne-yapilmali\/\" title=\"Site A\u00e7\u0131lm\u0131yor \u2014 Ad\u0131m Ad\u0131m Te\u015fhis Rehberi - Narhost Destek\">Site A\u00e7\u0131lm\u0131yor \u2014 Ad\u0131m Ad\u0131m Te\u015fhis Rehberi (konu merkezi)<\/a><\/li>\n<li><a href=\"https:\/\/narhost.com\/destek\/e-posta\/\" title=\"E-Posta destek kategorisi - Narhost\">Hata \u00e7\u00f6z\u00fcm merkezi (E-Posta kategorisi)<\/a><\/li>\n<li><a href=\"https:\/\/narhost.com\/destek\/postfix-out-452-4-3-1-insufficient-system-storage-hatasi-nasil-cozulur\/\" title=\"Postfix 452 Insufficient System Storage hatas\u0131 - Narhost Destek\">Postfix 452 Insufficient System Storage<\/a><\/li>\n<li><a href=\"https:\/\/narhost.com\/destek\/smtp-ayarlari-nasil-yapilmali\/\" title=\"SMTP ayarlar\u0131 nas\u0131l yap\u0131lmal\u0131 - Narhost Destek\">SMTP ayarlar\u0131 nas\u0131l yap\u0131lmal\u0131<\/a><\/li>\n<li><a href=\"https:\/\/narhost.com\/destek\/cpanel-ve-plesk-uzerinde-mail-limitleri-nereden-ayarlanir\/\" title=\"cPanel ve Plesk \u00fczerinde mail limitleri nereden ayarlan\u0131r - Narhost Destek\">Panel mail limitleri<\/a><\/li>\n<li><a href=\"https:\/\/narhost.com\/destek\/mail-alinamiyorsa-ne-yapmaliyim\/\" title=\"Mail al\u0131nam\u0131yorsa ne yapmal\u0131y\u0131m - Narhost Destek\">Mail al\u0131nam\u0131yorsa ne yapmal\u0131y\u0131m<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"kb-faq\">\n<h2>S\u0131k\u00e7a sorulan sorular<\/h2>\n<h3>552 5.3.4 hatas\u0131 ge\u00e7ici mi kal\u0131c\u0131 m\u0131?<\/h3>\n<p><code>5<\/code> ile ba\u015flayan durum kodu kal\u0131c\u0131 bir reddi belirtir; ileti b\u00fcy\u00fct\u00fclmeden yeniden g\u00f6nderilse de kabul edilmez. \u00c7\u00f6z\u00fcm ya sunucu s\u0131n\u0131r\u0131n\u0131 y\u00fckseltmek ya da iletiyi k\u00fc\u00e7\u00fcltmektir. Ge\u00e7ici (yeniden denenen) hatalar <code>4<\/code> ile ba\u015flar.<\/p>\n<h3>message_size_limit de\u011ferini ka\u00e7a ayarlamal\u0131y\u0131m?<\/h3>\n<p>Kullan\u0131c\u0131lar\u0131n g\u00f6nderdi\u011fi en b\u00fcy\u00fck eki, base64 kodlamas\u0131n\u0131n yakla\u015f\u0131k \u00fc\u00e7te bir ekledi\u011fini hesaba katarak \u00f6l\u00e7\u00fcn. 25 MB&#8217;l\u0131k ger\u00e7ek ekler i\u00e7in s\u0131n\u0131r\u0131 35 MB civar\u0131 (<code>36700160<\/code> byte) tutmak g\u00fcvenlidir. \u00c7ok y\u00fcksek bir de\u011fer sunucu kaynaklar\u0131n\u0131 riske atar.<\/p>\n<h3>De\u011fi\u015fiklikten sonra Postfix&#8217;i yeniden ba\u015flatmal\u0131 m\u0131y\u0131m?<\/h3>\n<p>Genelde gerek yoktur; <code>postfix reload<\/code> yap\u0131land\u0131rmay\u0131 servisi durdurmadan tazeler. Yaln\u0131z Postfix hi\u00e7 \u00e7al\u0131\u015fm\u0131yorsa <code>systemctl start postfix<\/code> ile ba\u015flat\u0131rs\u0131n\u0131z.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Postfix 552 5.3.4 Message size exceeds fixed limit hatas\u0131, g\u00f6nderilen iletinin boyutu message_size_limit s\u0131n\u0131r\u0131n\u0131 a\u015ft\u0131\u011f\u0131nda \u00e7\u0131kar. Mevcut s\u0131n\u0131r\u0131 okuma, main.cf i\u00e7inde de\u011feri b\u00fcy\u00fctme ve postfix reload ile uygulama ad\u0131mlar\u0131 tek kartta.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[26,48,67],"class_list":["post-588","post","type-post","status-publish","format-standard","hentry","category-e-posta","tag-e-posta","tag-mail","tag-postfix"],"meta_box":[],"_links":{"self":[{"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/posts\/588","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/comments?post=588"}],"version-history":[{"count":4,"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/posts\/588\/revisions"}],"predecessor-version":[{"id":1524,"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/posts\/588\/revisions\/1524"}],"wp:attachment":[{"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/media?parent=588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/categories?post=588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/narhost.com\/destek\/wp-json\/wp\/v2\/tags?post=588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}