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Symptoms. Emails are not delivered to email addresses hosted in Plesk or not sent to external hosts. The following error messages appear in /var/log/maillog.

2020/7/6 -Might be the recipient server block your domain or its associated IP address, through some spam filters or firewall.

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 ...

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.

2020/7/6 -I am getting this error message only when the user sends email to a particular domain. I have recently configured SPF, DKIM, DMARC records on ...

2018/8/22 -It sounds like your nameserver is not providing your postfix server with the result of: unbound-host 212.227.17.21 21.17.227.212.in-addr.

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.

2023/11/10 -My Thunderbird client has worked thus far. Now I cannot send messages from my "very" old account, where host domain is pp.htv.fi which has worked until ...

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.

1. Verify rDNS Record: Senders should check if their SMTP server's IP address has a corresponding and correct rDNS record. 2. Correcting rDNS Records: If ...