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

Reindl Harald h.reindl at thelounge.net
Tue Feb 26 04:41:19 UTC 2019

Am 25.02.19 um 22:39 schrieb Marco Shmerykowsky PE via samba:
> 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
> and
there is no error

when you configure
http://www.postfix.org/postconf.5.html#reject_unknown_sender_domain you
get what you asked for and since at this point
@sce252.internal.company.com is not found the message is *temporary*
rejected with 450

either order postfix to get started later so that dns lookups are
working or remove that option

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