UCS Mail-Server --> Reverse DNS does not match SMTP Banner

Apps & App Center
,
1

Hi - my setup is as follow:
1x primary (UCS1)
1x backup (UCS2)
1x ucs mail-server as replica (UCS3)

I’m using a local domain → privat-net.intranet
I’m using as well a public mail domain → MYDOMAIN.de

Mails are going out and coming in - internal and external communication is working. So all fine. If I’m checking my external mail domain via MX-Tools, I getting the following result:

grafik
grafik226×255 3.38 KB

All is green - just the SMTP banner check fails:
grafik

I’m quite sure that there must be a config file or something like that, that you can change the default setting of the mail-server into my external mail domain name. By testing also other mail domains (like google), I noticed that they are failing as well - but they are not showing the internal mail-server name. Eg GMX.de is not failing.

So is it a setting that I can change - or based on the Postfix server - it is as it is?

It’s not a show-stopper - but it would be the cherry on top.

Thank you in advance

2

das kann man hier setzen

grafik
grafik1482×987 103 KB

3

THX @externa1 for coming back to me.

This setting belongs to a different line (220):
image
image

So it must been somewhere else to get this part changed:
image

kind regards

4

Oh yes you’re right
250 is combined from postfix hostname and mydomain settings
in main.cf
you’ll have to set them to the external FQDN

br
Christian

p.s. if 250 does not match the external FQDN some mailservers do not accept mails (like google i think)

5

THX for the hint.

By checking the main.cf file I noticed the following entry:

image
image636×197 5.85 KB

Also in the file there are several section who might be right (or wrong).

It is my production system and I would like to avoid a negative impact by maybe changing something wrong ;-(

Kind regards

6

should be working with customized settings - see

https://docs.software-univention.de/manual/5.0/de/mail/configuration-server.html#mail-serverconfig-maincflocal