Amira Othman wrote:

>I have configure policyd with postfix but I want to understand what 
>happens to message after policy is applied on (for example it's 
>action is defer or hold). Does the message go back to postfix queue 
>to be resend or it's just not sent and the client has to manually 
>resend it

I don't know what hold does, but defer means that Postfix will 
respond to the client with a 4xx code meaning temporary failure. This 
will defer accepting the message and the client should re-attempt 
delivery later. The retry policy used is entirely down to the client 
(and it's administrator) - it's covered by section 4.5.4.1 in RFC 
5321 http://tools.ietf.org/html/rfc5321


Hmm, having checked, documentation on how Postfix intercts with a 
policy server is here :
http://www.postfix.org/SMTPD_POLICY_README.html

It references a separate document for the actions available :
http://www.postfix.org/access.5.html
It says of the action "Hold" :
>Place the message on the hold queue, where it  will sit  until 
>someone either deletes it or releases it for delivery.

So it sounds like it means Postfix would accept the message but put 
it on hold pending human intervention.

-- 
Simon Hobson

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