On 12/23/2016 06:50 AM, Odhiambo Washington wrote:
> 
> I know Exim will only treat a session as a failure if it gets 5xx. Does
> Postfix do the same?


Yes, mostly. Postfix treats any 4xx as retryable and retries at
configured intervals until the message is delivered or
maximal_queue_lifetime (default 5 days) expires. After
maximal_queue_lifetime the message is considered undeliverable (failure).

-- 
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan
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