Vista - Forward Email via Rule Error

I have a xxxx.comcast.net email address and can forward email manually to
another comcast.net email address via smtp.comcast.net server, however if I
set up a rule to forward email from the same sender to a comcast.net account,
I get an error that the email cannot be fowarded because it is being sent to
the same server as my account. If I set the rule up to forward to a hotmail
or yahoo account it goes through without flaw. Any ideas on how to get the
email to forward? I am running Vista Home Basic with McAfee Virus Scan.

Thanks,
Greg