> I am trying to get my head around mail relay ... We want to
> block people from relaying off our server except for valid
> customers.
Very good.
> I have set the option to be "Relay for Local Hosts"
Very bad.
That setting in plain english is "Relay for spammers who know how to forge the headers
of their E-mails", or simply "Relay for spammers." All a spammer has to do is use a
return address on your domain, and they can send their wares.
You want to use "Relay for addresses".
--
-Scott
Declude: Anti-virus and Anti-spam solutions for IMail. http://www.declude.com
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