Laura Atkins wrote:
The biggest problem is that the 4/5xy codes are what to do about THAT
message.
Big senders and big receivers are trying to use them to answer a
different question: what to do about the NEXT message. With a few
exceptions legitimate ESPs accept a 5xy as “don’t try this message
again” and a 4xy as “keep trying until timeout”. (There are a couple
that reattempt 5xy from different IPs, for reasons.)
There are "legitimate ESPs" on this list that have stated their policy
of treating 5xy as a 4xy temporary error you can retry...
Regards,
--
Michelle Sullivan
http://www.mhix.org/
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