grep filters to block open relay

[Dhawal Doshy]

hermit921 writes: 

[SNIP]
> 
> Don't ask me how silly this is - I feel like screaming.
> I just want to know if anyone else has ever heard of this type of 
> filtering being done.

qmail has a patch to specifically block these kind of patterns.. silly yes, 
but some open-relay (ordb or dsbl i can't remember) test would get my qmail 
servers listed for this very reason. (this was years back and i am not sure 
if this is still the case) 

 - dhawal 

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