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2014/10/26 -The ALTERNATE fix is to loosen your postfix restrictions from "reject_unknown_sender_domain" to "reject_unknown_reverse_client_hostname". But ...
2025/3/4 -The sender's mail server has invalid PTR record (reverse DNS). Resolution. Contact the server provider of the IP address in order to correct PTR ...
2017/10/13 -You have manually excluded myhostname from your mydestination , which by default has it. (This also happens if you pick some local delivery ...
2013/11/8 -When a user here sends an email to a particular domain it bounces back with: 450 4.7.1 Client host rejected: cannot find your hostname.
2013/11/22 -Check the DNS settings on the outbound mailserver. Make sure you alse have a PTR record set up for the hostname that is send with the EHLO/HELO ...
2021/12/9 -It seems that we do not have a reverse DNS record configured for the remote.ourhostname.com which can be causing our emails to be handled as spam or rejecting ...
2017/5/18 -I am using Plesk Onyx Version 17.5.3 Update #6 Web Host Edition on Ubuntu 14.04.5 LTS. I get this error when users try to send mail to any adress @siol.net.
2019/2/8 -You should be able to force a PTR record through unbound by adding the following to data/conf/unbound/unbound.conf in the server block.
2022/1/27 -'450 4.7.1 Client host rejected: cannot find your reverse hostname'; If the Exchange server cannot find the sender of the mail or the host ...
2023/11/28 -The error message mentions that they cannot find your reverse host name. This typically indicates that your PTR record still needs to be updated.