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2025/3/4 -Resolution. Contact the server provider of the IP address in order to correct PTR record and make it point to the mail server hostname. For ...
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 ...
2019/6/4 -You postfix configuration has reject_unknown_client_hostname which rejects mails because 28.90.9.96.sinet.com.kh. doesn't resolve back to 96.9.90.28.
2018/8/22 -I'm currently messing around with my mail-setup here. Everything is working properly except receiving mails (which should obv. work). I'm running the setup in ...
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.
2018/9/26 -Unknown clients are hostnames not matching or existing (FCrDNS) of the sending mailserver, unknown senders checks, if the domain of the sender address exists.
2014/10/26 -The ALTERNATE fix is to loosen your postfix restrictions from "reject_unknown_sender_domain" to "reject_unknown_reverse_client_hostname". But ...
2021/2/16 -Checks against the hostname are needed to ensure that the hostname is properly resolving to the server. Here are the commands needed to perform this check.
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.
2656124 - XS609. 450 4.7.1 Client host rejected: cannot find your hostname. Symptom. Messages (Email, SMS, etc.) being transferred via SMTP ...