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On Wed, 24 Mar 2010, Jakub Wasielewski wrote:
Why does the mail hit your backup MX in the first place? Is the primary
server offline?
Well, we are talking about backscatter done - in purpose - by
spammers. Why do they connect
So, do you need a backup MX at all, if the primary is online?
sendmail[pid]: queueid1: queueid2: DSN: reason
Yes it is. The reason is : User unknown:
Mar 20 04:54:18 [sm-mta] o2K3sEnS001039: o2K3sInS001048: DSN: User unknown
log entry. Can you verify that queueid1 is the queueid of the message that
entered your host from outside.
What does the other log entries of o2K3sEnS001039 say? Where it is from,
which relay, ...
Regards,
- --
Steffen Kaiser
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