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 john@dhh.gt.org (John Hasler) Dancing Horse Hill Elmwood, WI