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.
