Re: How to get Postfix to discard unknown instead of reject ???

Thanks for the reply Rick.

I know, I know, but...

We are getting blacklisted, receiving complaints, etc about
unsolicited bounces. When a spammer spoofs their sender's
address as CEO of company A, our system bounces the unknown
user back to him. He complains that we should be controlling
back-scatter. 

It's a no-win situation.

It's enough to make an IT guy want to pack it all in &
move to Tahiti  <

Mike Abraham
Conestoga College


>>> On 8/17/2007 at 8:59 AM, "Rick Zeman"
<RZemanmelwood.org> wrote:
  The RFCs say reject (bounce) failed delivery attempts, not
discard.  
  Think of some of the ramifications of doing otherwise:  a
client
  fumble-fingers typing in your CEO's email address and his
email promising
  you all zillions of dollars disappears into the
ether.....

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>I know, I know, but...
>
>We are getting blacklisted, receiving complaints, etc
about unsolicited 
>bounces. When a spammer spoofs their sender's address as
CEO of company A, 
>our system bounces the unknown user back to him. He
complains that we 
>should be controlling back-scatter.
>
>It's a no-win situation.
>
>It's enough to make an IT guy want to pack it all in
& move to Tahiti  <
>
>Mike Abraham
>Conestoga College
>

Assuming you are using Postfix and Maia as a gateway to
another server, it 
seems your gateway is not rejecting mail to invalid users,
it seems it's the 
downstream server that is rejecting and the gateway is
creating the bounces. 
The gateway must not accept mail to invalid users, period.

How to provide the relay server with a list of valid users 
(relay_recipient_maps) or do recipient address validation 
(reject_unverified_recipient) is well documented and often
discussed on the 
Postifx site and mailing list. If you reject at the gateway,
no bounce is 
created and your problem is solved.

Gary V

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