On Fri, 19 Mar 2021 at 00:27, Viktor Dukhovni <postfix-us...@dukhovni.org>
wrote:
> On Thu, Mar 18, 2021 at 11:30:56PM +0530, Durga Prasad Malyala wrote:
>
> > > If you want usable help, you'll need to be willing to post the actual
> > > domain name, not an obfuscated version.
> >
> > the domain is ucc-bsnl.co.in
>
> Thanks, yes the domain "ucc-bsnl.co.in" has neither MX records, nor any
> A or AAAA records. It does not receive email, and so many receiving
> MTAs, including yours, would not by default accept email from sender
> addresses in this domain:
>
> > The Log is:
> > Mar 18 23:09:25 mx5 postfix/smtpd[6039]: NOQUEUE: reject: RCPT from
> > mail-eopbgr1390048.outbound.protection.outlook.com[40.107.139.48]: 450
> > 4.1.8 <dltsupp...@ucc-bsnl.co.in>: Sender address rejected: Domain not
> > found; from=<dltsupp...@ucc-bsnl.co.in> to=<d...@datasoftcomnet.com>
> > proto=ESMTP helo=<IND01-BO1-obe.outbound.protection.outlook.com>
>
>
> > > > after googling I created a file called no_a_record.pcre with the
> > > following
> > > > contents.
>
> While I could ask you to repost the PCRE table, which likely has a
> mistake, the right fix is not use a PCRE table at all.
>
> > > post the output of "postconf -nf", being careful to
> > > not fold any lines, or otherwise add or remove whitespace.
> > > Do not send HTML email, compose it as plain text.
>
> You did not post the requested "postconf -nf" output showing your
> complete configuration, which may have other relevant rules. Please
> post it in reply to this message.
>
>
> > Is this OK?
> >
> > smtpd_sender_restrictions =
> > check_sender_access hash:/etc/postfix/access,
> > check_sender_access pcre:/etc/postfix/no_a_record.pcre,
> > [...]
> > reject_unknown_sender_domain
>
> It should work, given a correct PCRE table, however, as mentioned above,
> a better solution is not use PCRE at all:
>
> # Postfix 3.0 and later have an "inline" table type:
> #
> smtpd_sender_restrictions =
> check_sender_access hash:/etc/postfix/access,
> check_sender_access inline:{ucc-bsnl.co.in=OK}
> [...]
> reject_unknown_sender_domain
>
> Or you can just add:
>
> ucc-bsnl.co.in OK
>
> to the existing /etc/postfix/access, and "postmap" the table.
>
> --
> Viktor.
>
Thank you Victor.
I got it resolved by removing the first line of the old no_a_record.pcre
file.
So effectively my new no_a_record.pcre file has only 1 line.
/^.*ucc-bsnl.co.in$/ OK
also Using in main.cf...
smtpd_sender_restrictions =
check_sender_access hash:/etc/postfix/access,
check_sender_access pcre:/etc/postfix/no_a_record.pcre,
check_sender_access hash:/etc/postfix/joeweindb,
check_sender_access hash:/etc/postfix/ransomwaredombl,
reject_unknown_sender_domain
Thanks
DP
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