David MacQuigg wrote:
The automated system should stop retries after the *first* reject. Code 5xy
means there is a problem on the sender side. The sender is supposed to fix the
problem before trying again.
When a sending MTA receives a permanent rejection reply code, it will
usually generate a bounce message. What the sending software does upon
receipt of this bounce varies. In the case Mailman, a mailing list
manager, it takes bounced emails spread across five days for it to drop
a subscriber.
5.x.y SMTP reply codes are permanent errors. It might be a permanent
error because a downed MTA was brought back up before its configuration
was fully debugged. The reply code might be generated due to the
receiving MTA's use of an RBL that is now blacklisting all queries.
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