RE: [cobalt-users] SPAM relay bouncing causing mailserver on our network to retry constantly

["Dan Kriwitsky" <list1@xxxxxxxxxxxxxxxxxxxx>]

> Can anyone shed some light on how to prevent our mailservers 
> from trying to deliver this junk for 5 days?
> 
> One example email I got back from an ISP playing netcop 
> contains the following so we can identify them:
> 
> reason: 552 5.0.0 UCE not accepted.In case of error contact 
> the postmaster@xxxxxxxxxxxxxxxx
> 
> I am just fed up going through my postmaster messages for 
> these SPAMs and deleting them - I'd like to configure 
> sendmail to look for headers and NOT ATTEMPT to relay the 
> back to the original sender.

I'm not sure what you can do about this. I've seen it as well. Since
they're rejecting during the SMTP and before the DATA, your server now
has to handle that rejection. The only way it can do that, since you
already accepted the email, is to try to return to sender. 
My server already rejects about 95% of all email attempts using various
DNSBL and my own access list, so I'm not seeing too much of this. AFAIK,
the only thing you can do is try to delete the mailqueue holding it,
otherwise it will keep trying. I don't think they're playing netcop at
all. They're doing their job and blocking spam. 
-- 
C2003 Dan Kriwitsky

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