On 11/12/2019 6:33 AM, Dusan Obradovic wrote:
On Nov 11, 2019, at 2:27 PM, ratatouille <ratatoui...@bitclusive.de> wrote:
Hello all!
Received: from mail.namase.de (s1.bomberg.city [62.173.139.77])
I would like to reject incoming email if dns- and rdns-entries differ.
Does this make sense and how could I achieve this?
Kind regards
Andreas
Although it's a common occurrence that the host name specified in a HELO does
not match IP rDNS (even from a well-known mail providers), you'd look into
Postfix SMTP access policy delegation protocol to implement custom policy
action based on helo_name and client_name.
http://www.postfix.org/SMTPD_POLICY_README.html
You will be rejecting everything you get from Office 365, rDNS is for
the little people.
I am a big fan of rigid adherence to rDNS & SPF rules, doing so, however
would sentence me to a life in isolation.
--
John Schmerold
Katy Computer Systems, Inc
https://katycomputer.com
St Louis
