Slightly OT: Postfix smtpd restrictions

Zaeem Arshad zaeem.arshad at
Thu Jun 24 13:28:25 IST 2010

On Thu, Jun 24, 2010 at 4:57 PM, Jason Ede <J.Ede at> wrote:
> This is purely MTA based, but since a lot of users here run postfix...
> How have others found reject_unknown_reverse_client_hostname and the more
> harsh reject_unknown_client_hostname  in postfix? I’m debating implementing
> them here and wonder if others have found them problematic or useful? I
> thinking they should be good for weeding out spam emails and I can’t see
> that they should catch legitimate senders, but want to be sure.

I had implemented these but had to remove them because many of our
customers were receiving emails from misconfigured servers. Try
prefixing it with warning_if_reject and see how many hits you get. You
can analyze those and then decide for yourself.


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