From: Magnus Bäck (no email)
Date: Thu Jan 01 2004 - 14:20:46 EST
On Thu, Jan 01, 2004 at 11:57:35AM -0700,
Jon Langton <> wrote:
> I entered my mail server into www.ordb.org and verified that I am not an
> open relay yesterday.
Nope, that's not the problem. The problem is that you're accepting mail
for users that do not exist, causing Postfix to have to send out
bounces. Use the relay_recipient_maps feature of Postfix 2.0+ to let
Postfix reject such mail instead. How to extract valid recipients from
MS Exchange has been covered on this list numerous times before, and is
also described on a web page (can't remember the URL).
[...]
-- Magnus Bäck
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