It looks like the 4xx is not being relayed back to the sender (probably because the server is instructed to try again later)
Is there an error response that informs the sender while the server
still keeps trying?
Is there an error response that informs the sender while the server
still keeps trying?
Depends on the MTA of the sender - sendmail uses
Timeout.queuewarn
for this - see the docs for details.
Are RFC's defining things like what codes should generate response back
to the sender?
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