[IMail Forum] Large Rules list

[James Nelson]

I have an Imail server that hosts 3 physical domains, 20 virtual 
domains, and about 20 other domains that alias to these.  Because of 
this, we get a fairly large number of spoofed emails from things like 
'[EMAIL PROTECTED]', '[EMAIL PROTECTED]', etc that I'd like to crack down on.  I 
can identify messages that originate from outside our network easily 
enough, since all this goes through another server that stamps these 
messages.  However, in order to setup inbound rules to block this, I'm 
looking at setting up either 40+ rules to block inbound messages from 
our domains, or 1 rule with 40+ arguments.  Creating these rules and 
applying them isn't really a problem, but I'm worried that this might 
cause a lot of overhead on our server.  On an average day we receive 
about 90K messages and send out about 20K.  Can anyone tell me how Imail 
might handle large rulesets like this?

Thanks,
::James Nelson
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