Amira Othman wrote:

>I want to understand policy actions that apply to members specially 
>defer (by how much time message will be deferred) and the deference 
>between defer and hold

Not sure about hold, but defer means pass a result back to Postfix 
with the action of defer. Postfix will then respond to the client 
with a temporary failure code - with the result that the client will 
back off (defer) and retry delivery later.

A good example of this is with greylisting. On initial connection, 
unless the client-sender-recipient triplet is already whitelisted, 
the message is deferred. Any RFC compliant server will back off and 
try again later - eventually succeeding. Most spam software doesn't, 
and so the spam is blocked.

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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