On 2021-02-10 3:05 a.m., Alessandro Vesely wrote:
Hi Havard,
<snip>
That's what I've been doing. For an incoming message, a temporary
failure means replying a 4xx code. The sender keeps the message in its
queue, and eventually gives up. Once upon a time, MTAs used to retry
sending for five days. Nowadays, several servers don't let queued
messages grow older than one day.
In the most severe case, a failed DKIM signature might entail a reject.
So the best course of action seems to be to reserve temporary failures
to this case.
Still, being able to differentiate a local network congestion from a
remote bad configuration would help.
Best
Ale
Hi Ale and list,
This isn't an answer to your original question, but I was curious about
something you mentioned near the end of your message, where you wrote:
"Once upon a time . . . Nowadays, several servers don't let queued
messages grow older than one day".
Out of curiosity, what servers have you encountered that no longer use
the five day cutoff ?
Thanks,
- J
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