Pol Hallen <[email protected]> wrote:

> should DEFER put email to postfix queue?

No, the whole point is that it defers it - which means it tells Postfix to 
reject the message with a temporary fail (4xx) code. A reject means reject the 
message with a permanent fail (5xx) code.
The difference is that when a mail transport agent (aka mail server) has it's 
delivery attempt reject with a 4xx code it will requeue the message and try 
again later, but with a 5xx code it will not attempt another delivery and will 
do whatever the site config says to do - typically send a "sorry I couldn't 
deliver your message" email to the sender.

But when the sending client is a mail user agent (aka email program), the user 
will get an error message and will have to manually try sending again.


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