{"id":495,"date":"2025-05-03T01:17:33","date_gmt":"2025-05-02T22:17:33","guid":{"rendered":"https:\/\/hostvera.com.tr\/blog\/?p=495"},"modified":"2025-05-15T00:05:40","modified_gmt":"2025-05-14T21:05:40","slug":"e-posta-icin-spf-dkim-ve-dmarc-ayarlari-spam-koruma-rehberi","status":"publish","type":"post","link":"https:\/\/hostvera.com.tr\/blog\/e-posta-icin-spf-dkim-ve-dmarc-ayarlari-spam-koruma-rehberi\/","title":{"rendered":"E-posta \u0130\u00e7in SPF, DKIM ve DMARC Ayarlar\u0131: Spam Koruma Rehberi"},"content":{"rendered":"\n

E-posta \u0130\u00e7in SPF, DKIM ve DMARC Ayarlar\u0131: Spam Koruma Rehberi<\/strong><\/p>\n\n\n\n

Giri\u015f<\/strong>
E-posta altyap\u0131s\u0131n\u0131n g\u00fcvenli\u011fi ve itibar y\u00f6netimi, g\u00fcn\u00fcm\u00fczde markalar ve bireyler i\u00e7in kritik bir konudur. G\u00f6nderdi\u011finiz e-postalar al\u0131c\u0131n\u0131n gelen kutusuna d\u00fc\u015fmez, spam klas\u00f6r\u00fcne kayar veya hi\u00e7 teslim edilmezse ileti\u015fim kopar ve g\u00fcven kaybedilir. SPF, DKIM ve DMARC mekanizmalar\u0131, e-postalar\u0131n\u0131z\u0131n sahtecilik, kimlik taklidi (phishing) ve istenmeyen posta (spam) sald\u0131r\u0131lar\u0131na kar\u015f\u0131 korunmas\u0131n\u0131; ayn\u0131 zamanda e-posta teslimat oranlar\u0131n\u0131z\u0131n en \u00fcst seviyede kalmas\u0131n\u0131 sa\u011flar. Bu rehberde ad\u0131m ad\u0131m nas\u0131l yap\u0131land\u0131raca\u011f\u0131n\u0131z\u0131, DNS kay\u0131tlar\u0131n\u0131z\u0131 nas\u0131l ekleyece\u011finizi, test ve izleme y\u00f6ntemlerini, yayg\u0131n sorunlar\u0131 ve \u00e7\u00f6z\u00fcmlerini ele alaca\u011f\u0131z.<\/p>\n\n\n\n

SPF (Sender Policy Framework) Nedir ve Nas\u0131l Kurulur?<\/strong>
SPF, g\u00f6nderenin alan ad\u0131n\u0131n hangi sunuculardan e-posta g\u00f6ndermesine izin verildi\u011fini tan\u0131mlayan DNS tabanl\u0131 bir mekanizmad\u0131r. Al\u0131c\u0131 sunucu, mesaj\u0131 kabul etmeden \u00f6nce SPF kayd\u0131n\u0131za bakarak g\u00f6nderenin IP adresini kontrol eder. SPF kayd\u0131 eklemek i\u00e7in DNS y\u00f6netim panelinize gidin ve TXT kayd\u0131 olu\u015fturun. \u00d6rnek bir SPF kayd\u0131 \u015f\u00f6yle g\u00f6r\u00fcn\u00fcr:<\/p>\n\n\n\n

v=spf1 mx a ip4:203.0.113.10 include:mailservice.com -all<\/p>\n\n\n\n

Bu tan\u0131mda v=spf1 s\u00fcr\u00fcm\u00fc belirler; mx ve a ile posta sunucular\u0131n\u0131z\u0131, ip4 ile tek bir IP\u2019yi, include ile \u00fc\u00e7\u00fcnc\u00fc parti e-posta sa\u011flay\u0131c\u0131n\u0131z\u0131 ekler; -all ile bu kay\u0131tta listelenmeyen t\u00fcm kaynaklardan gelen postalar\u0131n reddedilmesini zorunlu k\u0131lar. Daha esnek kabul i\u00e7in ~all (softfail) veya ?all (neutral) kullanabilirsiniz. Kayd\u0131 girdikten sonra dig TXT example.com veya nslookup -type=TXT example.com komutlar\u0131yla do\u011frulay\u0131n.<\/p>\n\n\n\n

DKIM (DomainKeys Identified Mail) Nedir ve Nas\u0131l Yap\u0131land\u0131r\u0131l\u0131r?<\/strong>
DKIM, e-postan\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc ve kayna\u011f\u0131n\u0131 do\u011frulamak i\u00e7in mesaj ba\u015fl\u0131klar\u0131na dijital imza ekleyen bir protokold\u00fcr. Sunucunuz her g\u00f6nderide \u00f6zel anahtar\u0131n\u0131zla mesaj\u0131 imzalar; al\u0131c\u0131 sunucu DNS\u2019deki a\u00e7\u0131k anahtarla bu imzay\u0131 do\u011frular. Kurulum i\u00e7in:<\/p>\n\n\n\n

    \n
  1. Mail sunucunuzun veya \u00fc\u00e7\u00fcnc\u00fc parti servisin DKIM anahtar \u00e7ifti \u00fcretme arac\u0131n\u0131 kullanarak bir selector (\u00f6rne\u011fin mail) ve 1024- veya 2048-bit RSA anahtar \u00e7ifti olu\u015fturun<\/li>\n\n\n\n
  2. DNS\u2019e selector.mail._domainkey.example.com ad\u0131 alt\u0131nda bir TXT kayd\u0131 ekleyin; de\u011fere v=DKIM1; k=rsa; p=PUBLIC_KEY format\u0131ndaki a\u00e7\u0131k anahtar\u0131 yap\u0131\u015ft\u0131r\u0131n<\/li>\n\n\n\n
  3. Sunucunuzda ayn\u0131 selector ve \u00f6zel anahtar\u0131 kullanacak \u015fekilde DKIM imzalama mod\u00fcl\u00fcn\u00fc (OpenDKIM, Postfix milter, Exim filter) yap\u0131land\u0131r\u0131n<\/li>\n\n\n\n
  4. Test etmek i\u00e7in g\u00f6nderdi\u011finiz e-postan\u0131n ba\u015fl\u0131klar\u0131nda DKIM-Signature alan\u0131n\u0131n olup olmad\u0131\u011f\u0131na bak\u0131n ve DKIM validator ara\u00e7lar\u0131yla (e.g. dkimvalidator.com) imzay\u0131 do\u011frulay\u0131n<\/li>\n<\/ol>\n\n\n\n

    DMARC (Domain-based Message Authentication, Reporting & Conformance) Nedir ve Ni\u00e7in Gereklidir?<\/strong>
    DMARC, SPF ve DKIM sonu\u00e7lar\u0131n\u0131 birle\u015ftirip politikan\u0131z\u0131 belirlemenizi, raporlama alman\u0131z\u0131 sa\u011flayan bir katmand\u0131r. DMARC kayd\u0131yla \u201cBu alan ad\u0131 ad\u0131na SPF veya DKIM\u2019i ge\u00e7emeyen mesajlar\u0131 nas\u0131l y\u00f6netsin: kabul etsin, karantinaya ats\u0131n veya reddetsin\u201d diyebilirsiniz. Ayr\u0131ca g\u00fcnl\u00fck raporlar (rua) ve ger\u00e7ek zamanl\u0131 hata raporlar\u0131 (ruf) alarak yanl\u0131\u015f yap\u0131land\u0131rmalar\u0131 tespit edersiniz. \u00d6rnek bir DMARC kayd\u0131:<\/p>\n\n\n\n

    v=DMARC1; p=quarantine; rua=mailto:dmarc-rua@example.com; ruf=mailto:dmarc-ruf@example.com; pct=100; adkim=s; aspf=s<\/p>\n\n\n\n

    p ile politika (none, quarantine, reject) belirlenir; rua ve ruf adreslerine XML format\u0131nda raporlar gelir; pct ile politikan\u0131n y\u00fczdesi; adkim\/aspf ile DKIM ve SPF alignment (s-strict veya r-relaxed) ayarlan\u0131r. DNS\u2019e TXT kayd\u0131n\u0131 _dmarc.example.com ad\u0131 alt\u0131nda ekledikten sonra dig TXT _dmarc.example.com ile kontrol edin.<\/p>\n\n\n\n

    DNS Kayd\u0131 Ekleme ve Propagasyon<\/strong>
    DNS de\u011fi\u015fiklikleri \u00e7o\u011funlukla 5\u201330 dakika i\u00e7inde yay\u0131l\u0131r ancak TTL\u2019e ba\u011fl\u0131 olarak saatler s\u00fcrebilir. Test a\u015famas\u0131nda d\u00fc\u015f\u00fck TTL (300 saniye) kullanmak, hatalar\u0131 h\u0131zl\u0131 yakalaman\u0131za yard\u0131mc\u0131 olur. Kayd\u0131 eklerken DNS sa\u011flay\u0131c\u0131n\u0131z\u0131n paneline gidin, TTL de\u011ferini 300\u2019e ayarlay\u0131n, TXT kayd\u0131 ba\u015fl\u0131\u011f\u0131n\u0131 ve i\u00e7eri\u011fini eksiksiz girin. Yay\u0131l\u0131m\u0131 kontrol etmek i\u00e7in \u00e7e\u015fitli public DNS sunucular\u0131ndan dig ve online ara\u00e7larla do\u011frulay\u0131n.<\/p>\n\n\n\n

    SPF, DKIM ve DMARC Test Ara\u00e7lar\u0131<\/strong><\/p>\n\n\n\n

      \n
    • SPF: Kitterman SPF tester, MXToolbox SPF lookup<\/li>\n\n\n\n
    • DKIM: DKIMCore, Mail-Tester<\/li>\n\n\n\n
    • DMARC: DMARC Analyzer, MXToolbox DMARC lookup
      Bu ara\u00e7lar, kayd\u0131n\u0131z\u0131n do\u011fru formatta olup olmad\u0131\u011f\u0131n\u0131, syntaks hatalar\u0131n\u0131 ve alignment sorunlar\u0131n\u0131 size bildirir.<\/li>\n<\/ul>\n\n\n\n

      Rapor Okuma ve S\u00fcrekli \u0130zleme<\/strong>
      DMARC raporlar\u0131 her g\u00fcn rua adresinize XML format\u0131nda gelir. \u0130\u00e7erdi\u011fi bilgiler; g\u00f6nderen IP, g\u00f6nderilen e-posta say\u0131s\u0131, SPF\/DKIM ba\u015far\u0131s\u0131zl\u0131k oran\u0131, alignment durumu ve genel hata kodlar\u0131d\u0131r. Bu raporlar\u0131 analiz etmek i\u00e7in Google Sheets ile XML parse eden script\u2019ler veya dmarcian, postmastertools gibi servisleri kullanabilirsiniz. SPF ba\u015far\u0131s\u0131zl\u0131klar\u0131 \u00e7o\u011funlukla IP listesi eksikli\u011fi; DKIM hatalar\u0131 ise imza mod\u00fcl\u00fc hatal\u0131 yap\u0131land\u0131rma veya yanl\u0131\u015f selector kullan\u0131mdan kaynaklan\u0131r.<\/p>\n\n\n\n

      Yayg\u0131n Sorunlar ve \u00c7\u00f6z\u00fcmler<\/strong>
      SPF kayd\u0131n\u0131zda \u00e7ok fazla include kullanmak 10 limitine tak\u0131labilir. Bu durumda alt domain\u2019lerde veya farkl\u0131 alt kay\u0131tlarda SPF delegasyonu yaparak b\u00f6l\u00fcmlendirme \u00f6nerilir. DKIM imza hatalar\u0131nda a\u00e7\u0131k anahtar\u0131n DNS\u2019de tam olarak e\u015fle\u015fti\u011finden, sat\u0131r sonu veya bo\u015fluk hatas\u0131 olmad\u0131\u011f\u0131ndan emin olun. DMARC quarantine politikas\u0131na ge\u00e7ti\u011finizde raporlar\u0131 incelemeden do\u011frudan p=reject kullanmay\u0131n; \u00f6nce none politikas\u0131yla veri toplay\u0131p, alignment oran\u0131n\u0131z\u0131 %95\u2019in \u00fcst\u00fcne \u00e7\u0131kard\u0131ktan sonra %100 reject politikas\u0131na ge\u00e7in.<\/p>\n\n\n\n

      E-posta Ak\u0131\u015f\u0131 ve BaseLine \u0130yile\u015ftirmeleri<\/strong>
      E-posta g\u00f6ndermeden \u00f6nce IP itibar\u0131n\u0131z\u0131 kontrol edin. Senderscore, Talos Reputation gibi ara\u00e7lar IP adresinizin blacklist durumunu g\u00f6sterir. Yeni bir IP veya sunucu kullan\u0131yorsan\u0131z, warm-up \u015feklinde \u00f6nce d\u00fc\u015f\u00fck hacimle ba\u015flay\u0131p yava\u015f\u00e7a artt\u0131rmak, provider spam filtresinin size g\u00fcven olu\u015fturmas\u0131na yard\u0131mc\u0131 olur. Y\u00fcksek hacimli haber b\u00fclteni g\u00f6nderimlerinde SMTP throttling, list hygiene (bounce ve undeliverable temizli\u011fi) ve opt-out link kontrol\u00fc base line tedbirleriniz aras\u0131nda olmal\u0131d\u0131r.<\/p>\n\n\n\n

      G\u00fcvenlik ve Gizlilik<\/strong>
      SPF, DKIM ve DMARC ile e-posta do\u011frulama sa\u011flarken, private key\u2019lerinizi mutlaka sunucu d\u0131\u015f\u0131nda, g\u00fcvenli bir ortamda (HSM, Vault) tutun. DNS API anahtarlar\u0131n\u0131z\u0131 rotate edin. Rapor ve log verilerini belirli bir s\u00fcre saklay\u0131p, GDPR ve KVKK uyumlu \u015fekilde ar\u015fivleyin veya anonimle\u015ftirin.<\/p>\n\n\n\n

      Sonu\u00e7<\/strong>
      SPF, DKIM ve DMARC katmanlar\u0131, bir arada \u00e7al\u0131\u015farak e-posta itibar\u0131n\u0131z\u0131 korur, al\u0131c\u0131 filtrelerinden ge\u00e7me oran\u0131n\u0131 y\u00fckseltir ve marka g\u00fcveninizi art\u0131r\u0131r. Do\u011fru DNS kayd\u0131 ekleme, test, izleme, rapor analizi ve a\u015famal\u0131 politika y\u00fckseltme ad\u0131mlar\u0131n\u0131 takip ederek spam ve phishing ataklar\u0131na kar\u015f\u0131 g\u00fc\u00e7l\u00fc bir savunma hatt\u0131 olu\u015fturabilirsiniz. Sunucu veya \u00fc\u00e7\u00fcnc\u00fc parti e-posta sa\u011flay\u0131c\u0131lar\u0131yla \u00e7al\u0131\u015f\u0131rken bu mekanizmalar\u0131 d\u00fczenli g\u00fcncelleyin ve periyodik olarak do\u011frulay\u0131n, b\u00f6ylece her zaman kesintisiz ve g\u00fcvenli e-posta ileti\u015fimi sa\u011flam\u0131\u015f olursunuz.<\/p>\n","protected":false},"excerpt":{"rendered":"

      E-posta \u0130\u00e7in SPF, DKIM ve DMARC Ayarlar\u0131: Spam Koruma Rehberi Giri\u015fE-posta altyap\u0131s\u0131n\u0131n g\u00fcvenli\u011fi ve itibar y\u00f6netimi, g\u00fcn\u00fcm\u00fczde markalar ve bireyler i\u00e7in kritik bir konudur. G\u00f6nderdi\u011finiz e-postalar al\u0131c\u0131n\u0131n gelen kutusuna d\u00fc\u015fmez, spam klas\u00f6r\u00fcne kayar veya hi\u00e7 teslim edilmezse ileti\u015fim kopar ve g\u00fcven kaybedilir. SPF, DKIM ve DMARC mekanizmalar\u0131, e-postalar\u0131n\u0131z\u0131n sahtecilik, kimlik taklidi (phishing) ve istenmeyen posta […]<\/p>\n","protected":false},"author":1,"featured_media":553,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ub_ctt_via":"","footnotes":""},"categories":[20],"tags":[45],"class_list":["post-495","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hosting","tag-dns"],"featured_image_src":"https:\/\/hostvera.com.tr\/blog\/wp-content\/uploads\/2025\/05\/E-posta-Icin-SPF-DKIM-ve-DMARC-Ayarlari-1_1-scaled.png","author_info":{"display_name":"admin","author_link":"https:\/\/hostvera.com.tr\/blog\/author\/hostvera\/"},"yoast_head":"\nSPF, DKIM ve DMARC ile G\u00fcvenli E-posta<\/title>\n<meta name=\"description\" content=\"SPF, DKIM ve DMARC ile e-posta g\u00fcvenli\u011finizi art\u0131r\u0131n! 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