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On 5/19/10 4:13 PM, Mikael Syska wrote:

> If there are multiple exchange backends for postfix/spamasassin 
> gateway ... how could one validate that users exists, given that you 
> only have a list of valid users for some of the exchange servers and 
> the mailahead/milterahead/smtp are not an option?

Postfix can handle this, see:

http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient

- -- 
David Morton <morto...@dgrmm.net>

Morton Software & Design  http://www.dgrmm.net - Ruby on Rails
                                                 PHP Applications
Maia Mailguard http://www.maiamailguard.com    - Spam management
                                                 for mail servers
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