[Samba] Samba AD Internal DNS, Postfix & Email Relay

L.P.H. van Belle belle at bazuin.nl
Mon Feb 25 09:10:02 UTC 2019

Talking for postfix, might be handy to know also. 

Ive setup MX record on the mailrelay.internal.domain.tld for the mail relay server.
And ofcource the internet MX records.. 

For the internal member servers, the postfix setups are default, they lookup the MX record for internal.domain.tld. 
And if i must define a relay its smtp.internal.domain.tld, where smtp is a CNAME to the relay servername internaly. 
When i change my relay, i change the CNAME and MX record and im done for all my other servers. 

And no relay= , is defined in postfix's master.cf on other servers, except if something is really needing it. 

The relay contains and used transport maps 
# the internal mail end point. 
domain.tld        smtp:mail.internal.domain.tld:25

The relay is named. 
mailrelay.domain.tld ( inet side)	(MX 10)
mailrelay.internal.domain.tld (lan side)	(MX 10) 

Combine this with the bind setup and your resolving is always correct. 



> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Reindl Harald via samba
> Verzonden: maandag 25 februari 2019 0:16
> Aan: Marco Shmerykowsky; samba at lists.samba.org
> Onderwerp: Re: [Samba] Samba AD Internal DNS, Postfix & Email Relay
> Am 24.02.19 um 23:59 schrieb Marco Shmerykowsky via samba:
> > Is there an extra step which must be taken to get postfix
> > to deliver email via a relay host when the postfix machine
> > is pointing to an samba internal DNS?
> > 
> > I did a test setup using a public DNS server and it worked.
> > Same setup where the machine (Debian 9) is pointing to a
> > samba DNS doesn't work.  The errors in the postfix log
> > seem to be DNS related.
> besides that you should post said errors:
> relayhost = [x.x.x.x]:25
> relayhost = [hostname]:25
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