Postfix/Dovecot reverse DNS does not match with your sending domain - virtual domain outgoing IP

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#1 Sat, 02/02/2019 - 05:10
moskit
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Postfix/Dovecot reverse DNS does not match with your sending domain - virtual domain outgoing IP

I enabled in Virtualmin Sender Dependent Outgoing IP Address (https://www.virtualmin.com/documentation/email/dependent),

But email from (user@domain.com) send from the server (from server.hostname.com) now is sent with header: Received: from server.hostname.com (domain.com. [DomainIP]) by mx.google.com with ESMTPS id s12-v6si8411755lji.172.2019.02.02.01.47.26

and making the test from: https://www.mail-tester.com/

I receive warning: Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address. Some companies such as AOL will reject any message sent from a server without rDNS, so you must ensure that you have one. You cannot associate more than one domain name with a single IP address. Your IP address DomainIP is associated with the domain domain.com. Nevertheless your message appears to be sent from server.hostname.com.

You may want to change the host name of your server to domain.com.

Here are the tested values for this check: IP: DomainIP
HELO: server.hostname.com
rDNS: domain.com.

Is it a way to fix it and change server.hostname.com to virtual server domain.com to mach it with rDNS? Is there any other solution?

Wed, 02/06/2019 - 05:32
BBuchanan1013

You can change (or in most cases ask isp to change) the rDNS to match server.hostname.com

Sat, 02/16/2019 - 14:17
adamjedgar

Ah yes i remember this little annoyance. Struck thus nasty one myself a while back on my google cloud instance. I had to submit a request using google cloud interface to have this alterred. Was a pain in the bum.

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