Erik Dörnbach wrote:
> How can I make sure the only hosts allowed to send in the name of
> "aaa.com" belong to a certain network/IP range? Guess I missed out a
> feature or something?

That is exactly what Sender Permitted From is about.  See
http://spf.pobox.com/

-- 
John Hasler
[EMAIL PROTECTED] (John Hasler)
Dancing Horse Hill
Elmwood, WI


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