What should be the correct hostname of PMG

[zw1d]

Hi,
in my setup I have PMG and mailcow next to it. I'm trying to figure out what is the correct DNS and hostname setup for these.

`mail.mydomain.net` is the MX server and DNS/rDNS is set to the public ip.

Port 25 goes to PMG (ip: 10.0.0.6)
Ports 80,110,143,443,465,587,993,995,4190 go to mailcow (ip: 10.0.0.7)

mailcow's hostname is set as `mail.mydomain.net` - so webmail and the certs automatically generated work correctly
pmg's hostname is `pmg.mydomain.net`

In this setup sending and receiving emails works correctly - however, when I tested an outgoing email with mail-tester.com, even though I got 10/10 score, there was one part of the report that made me wonder:



When I change hostname of pmg server to mail.mydomain.net incoming emails end up with (this is PMG log):

status=bounced (mail for [10.0.0.7]:25 loops back to myself)

What hostname should PMG have?

 

[Bob.Dig]

You probably should "Disable MX lookups for default relay".

 

[zw1d]

Thanks for the reply,
I just tested that, and nothing changes. Message bounces the same.

(mail for [10.0.0.7]:25 loops back to myself)

 

[czechsys]

You are using 1 public IP for multiple servers hidden behind firewall with forwarded ports?

 

[zw1d]

You are using 1 public IP for multiple servers hidden behind firewall with forwarded ports?

I do have multiple IPs, but in this setup I'm using one IP, for both mailcow and pmg. Yes, the ports are forwarded.