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

I enabled in Virtualmin Sender Dependent Outgoing IP Address (,

But email from ( send from the server (from now is sent with header: Received: from ( [DomainIP]) by with ESMTPS id s12-v6si8411755lji.172.2019.

and making the test from:

I received warning You're not fully authenticated:

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 Nevertheless your message appears to be sent from

You may want to change the host name of your server to

Here are the tested values for this check:
IP: DomainIP

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



Howdy -- thanks for contacting us!

It sounds like the basic sender dependent outgoing setup is working correctly, but it may just be missing reverse DNS.

Note that when using sender dependent outgoing IP's, the email will be delivered using the domain's dedicated IP, but the HELO name will still be the server name.

That doesn't appear to be related to the issue above though, it looks like you may just need to ensure that there's a reverse DNS record setup for your domain's IP. That's something you'd have your provider do, many providers offer a web interface for that, though others you can just contact their support for information on how to set that up.