Merhabalar.
Sinucuda bulunan tüm hesaplar Yahoo uzantılı adreslere mail gönderemiyor. Gönderilen mailler aşağıdaki cevap geliyor.
Dmarc, spf ve rdns ayarları tam, ip ve domainler hiç bir rbl listesinin blacklist inde yok.

Önerisi olanlara şimdiden teşekkür ederim.

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

Xxxx@yahoo.com
host mta5.am0.yahoodns.net [67.195.204.73]
SMTP error from remote mail server after pipelined MAIL FROM:<proje@xxxxxx.com> SIZE=12381:
553 5.7.2 [TSS09] All messages from 5.133.xxx will be permanently deferred; Retrying will NOT succeed. See https://postmaster.yahooinc.com/error-codes