how to bock mailservers that have only an ip address

[Kai Schaetzl]

Jim Holland wrote on Mon, 1 May 2006 13:45:08 +0200 (CAT):

> I wonder 
> however if anyone has done any research into one aspect of the behaviour 
> of some spammers: I suspect that when a spam message is rejected directly, 
> they then pass the message off to a different server, using a round-robin 
> approach and making multiple delivery attempts from different locations in 
> the hope that eventually one of them will get through.  If this is indeed 
> a significant element in spamming behaviour then the overall traffic load 
> might be less by simply accepting spam and then quarantining it than by 
> trying to reject it at MTA level.

My personal experience is that domains which accept everything (which 
includes having a catch-all email alias) "attract" more spam than others. 
This "experience" is not from a scientific study but just a gut feeling from 
what I see with our customers from time to time, though.

Kai

-- 
Kai Schätzl, Berlin, Germany
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