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

Marco Shmerykowsky PE marco at sce-engineers.com
Mon Feb 25 21:39:05 UTC 2019

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 at sce-engineers.com>, orig_to=<root>, relay=mail.panix.com[1]:587, delay=317791, delays=317743/0.02/48/0.1, dsn=4.1.8,
status=deferred (host mail.xxxx.com[] said:
  450 4.1.8 <root at sce252.internal.company.com>: Sender address
rejected: Domain not found (in reply to RCPT TO comm

> 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 at lists.samba.org] Namens
>> Marco Shmerykowsky via samba
>> Verzonden: zondag 24 februari 2019 23:59
>> Aan: samba at lists.samba.org
>> 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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