> I am getting the same error message when trying to send
> email to email servers other than yahoo, and I have
> tried sending multiple times to yahoo and the others
> at different times with the same result

Firewall?  I understand that some ISPs, in an effort to stop Internet worms,
have started to block outgoing SMTP connections except to their own SMTP
servers.  What happens if you:

  telnet mx4.mail.yahoo.com smtp

from the same system as James would try?  You would want to receive:

  220 YSmtp mta351.mail.scd.yahoo.com ESMTP service ready
  quit
  221 mta351.mail.scd.yahoo.com

The 220 response came from yahoo, then I typed quit and yahoo closed the
connection after issuing the 221 response.

        --- Noel


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