Neil Youngman via mailop <mailop@mailop.org> (Di 20 Apr 2021 11:06:10 CEST): > I have observed that messages from our system are temporarily rejected > as greylisted by one destination but they are never accepted on retry. > The response is logged as "DATA: 451 0.0.0 1 recipients being greylisted > for 5 minutes". We retry after 10 minutes and get the same response.
That is 451 as the response to the "DATA" command? Or to the final dot, after
the DATA beeing sent?
The mentioned 1 recipient was the only recipient? Then I'd ask why they
do not reject the individual recipient with 4xx already at the RCPT
phase, or, if they do, why - after having a rejected recipient, your
server tries to send DATA.
In case they're greylisting after the final dot, make sure that not only
the IP, the sender, and the recipients list are identical to the first
attempt, but also the DATA (header+body) of your message.
I think, this will be difficult, if possible at all. Depends on *your*
mailsystem. And of course on their processing of the header+body.
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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