On 27/02/2021 23:36, MRob via Exim-users wrote:
>>> I'm getting lots of these in exim log:
>>> 2021-02-25 04:31:15.790 [19189] SSL_write: (from
>>> mail-pu1apc01hn2214.outbound.protection.outlook.com (APC01-PU1-
>>> obe.outbound.protection.outlook.com) [52.100.183.214]:42879) syscall:
>>> Connection reset by peer
> I found this situation because single user forwarded microsoft bounce message to their user said:
>
> Generating server: AM6PR05MB6309.eurprd05.prod.outlook.com
> Total retry attempts: 26
>
> user@???
> Remote Server returned '550 5.4.300 Message expired -> 451 Temporary local problem - please try later'
>
> So checking my log I found the last attempt to deliver this message resulted in this situation where outlook.com immediately dissconnected (its how I learned about this "connection reset").
The question is: did your exim log a message acceptance (a "<=" line) ?
If so, this 451 is definitively their problem. On the other hand, if your
system had logged several "Temporary reject" lines referencing this user
and outlook, it is your problem (and separate from the TCP RST issue).
--
Cheers,
Jeremy
