>When I am external (outside of the office on the other side of the firewall)
>using an ISP (ATT or Mindspring/Earthlink, etc) I am not able to connect to
>the mail server. I can ping the mail server with the smtp address. When I
>try and do a mail relay check it doesn't connect.
Your ISP is not allowing you to connect to your mailserver. They require
you to send any mail through their servers (which hopefully do not restrict
the return address you use).
-Scott
Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for
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