From:
http://www.insideoe.com/problems/errors.htm#relay550
550 - Relaying not allowed

This error message is coming from the mail server, not from OE itself. It
means that the SMTP (outgoing) mail server did not recognize you as an
authorized user and so rejected your message. Most ISPs configure their SMTP
servers to recognize only those whose IP address is on the accepted list,
meaning that you are connected directly to that ISP. If you use multiple
ISPs, you are likely to encounter this problem. The solution is to change
the SMTP server for that mail account under Tools| Accounts| account name
Properties| Servers.

Another possible reason for this error is anti-virus software that
configures OE to use a local proxy for the SMTP server. Since scanning
e-mail is not necessary to protect your computer, you should disable the
e-mail scan in your anti-virus product, and then re-enter the correct name
for your SMTP server.
--
Bruce Hagen
MS MVP - Outlook Express
~IB-CA~


"Ken" wrote in message
...
I cannot send e-mail from Outlook express and I keep getting the message
saying e-mail rejected.
With server error 550, error number 0x800ccc79.
Can anyone help me,

Ken