On 18.03.21 22:21, Durga Prasad Malyala wrote:
A govt mail sender is relaying mails through one of the servers
mail-vi1eur05on2047.outbound.protection.outlook.com or
mail-eopbgr1380070.outbound.protection.outlook.com or some similar sounding
server -  but I am getting the error "Sender address rejected: Domain not
found exception" in my mail server.
I have checked this and the sender domain does not have a MX record.

does that domain have A record?

This is a Govt Body and they are not responding to any mails we tried
through their abuse ID and their website etc.
We are desperate and so How do I whitelist this domain as an exception as
we desperately need the OTP mail sent by this Govt body.

The sender domain has - a special character as well in their domain like
abc-dfgh.co.in.

after googling I created a file called no_a_record.pcre with the following
contents.

smsupp...@abc-dfgh.co.in
/^.*abc-dfgh.co.in$/ OK

also added in main.cf. ...
smtpd_sender_restrictions =
       check_sender_access hash:/etc/postfix/access,
pcre:/etc/postfix/no_a_record.pcre,

this has to be "check_sender_access pcre:/etc/postfix/no_a_record.pcre".
however, you can put abc-dfgh.co.in to /etc/postfix/access, you don't need
pcre for that.


--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
I wonder how much deeper the ocean would be without sponges.

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