Cant send mail

[AshtonH]

I get this message when sending mail. Any help?

The message could not be sent. The authentication setting might not be
correct for your outgoing e-mail [SMTP] server. For help solving this
problem, go to Help, search for "Troubleshoot Windows Mail", and read the
"I'm having problems sending e-mail" section. If you need help determining
the proper server settings, please contact your e-mail service provider.

The rejected e-mail address was , Account: 'POP3.roos.umkc.edu', Server:
'SMTP.exchange.umkc.edu', Protocol: SMTP, Server Response: '501 5.5.4 Invalid
Address', Port: 587, Secure(SSL): No, Server Error: 501, Error Number:
0x800CCC79

 

[Gary VanderMolen]

Since you removed the email address from the error message, I can't
check its validity. I assume you are getting that error only with that one
recipient. This would indicate you have a bad email address for that
recipient.