[prev in list] [next in list] [prev in thread] [next in thread] 

List:       postfix-users
Subject:    Refuse mail from hosts with closed port 25
From:       Paul van der Vlis <paul () vandervlis ! nl>
Date:       2019-09-16 12:47:35
Message-ID: ec7f94ef-25ef-cdcf-0233-d32d676c49b3 () vandervlis ! nl
[Download RAW message or body]

Hello,

How can I refuse mail from hosts who don't have an open port 25?

What do you think from such a check?

Is there more needed?  E.g. a list of exceptions for some big providers?

Background:
I've investigated why somebody did not receive mail from a virtual
machine, and I found out her provider (reviced.nl) refuses all mail from
a host what does not have port 25 open. I have much problems with spam
and I would like to reduce it.



-- 
Paul van der Vlis Linux systeembeheer Groningen
https://www.vandervlis.nl/
[prev in list] [next in list] [prev in thread] [next in thread]