grep filters to block open relay

Kai Schaetzl maillists at
Fri Mar 24 12:31:39 GMT 2006

Stephen Swaney wrote on Thu, 23 Mar 2006 21:27:52 -0500:

> Actually Exchange before Exchange 2003 cannot be configured to reject email 
> for unknown users :(

I wrote "can be configured to not be an open relay" ;-) Just accepting unknown 
users in the domain isn't an open relay. That Exchange isn't a product one 
likes to administer is for sure, f.i. older versions of Exchange tried by 
default to forward external non-envelope (!) addresses.


Kai Schätzl, Berlin, Germany
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