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





On 2/25/2019 3:36 AM, L.P.H. van Belle via samba wrote:
Hai Marco,

For you own domains, dont point postfix to your internal DNS only,
if done wrong you might miss dns info on the wan side and thats mostlikely your error .

Likely.  Here is the error (ignore the ip's - messed them
up for this response):

Feb 25 16:22:10 sce252 postfix/smtp[3114]: 0D1E86E3A6D:
to=<marco@xxxxxxxxxxxxxxxxx>, orig_to=<root>, relay=mail.panix.com[1
6.8.1.8]:587, delay=317791, delays=317743/0.02/48/0.1, dsn=4.1.8,
status=deferred (host mail.xxxx.com[6.4.1.9] said:
 450 4.1.8 <root@xxxxxxxxxxxxxxxxxxxxxxxxxxx>: Sender address
rejected: Domain not found (in reply to RCPT TO comm
and))


Setup a caching DNS and setup a forward zone to internal.domain.tld and domain.tld. ( internet dns )
That makes sure that you dont break DKIM/DMARC/SPF/TLSA on the internet side.

UGH..... Another thing to learn :(



Greetz,

Louis


-----Oorspronkelijk bericht-----
Van: samba [mailto:samba-bounces@xxxxxxxxxxxxxxx] Namens
Marco Shmerykowsky via samba
Verzonden: zondag 24 februari 2019 23:59
Aan: samba@xxxxxxxxxxxxxxx
Onderwerp: [Samba] Samba AD Internal DNS, Postfix & Email Relay


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.

Thanks,

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