Will not send

My email has been working fine all day and now it won't let me send anything
using WindowMail from Comcast.net.
This is my error can anyone help me please????????

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 ''. Subject 'Fw: [
Car AC Check]', Account: 'comcast.net', Server: 'smtp.comcast.net', Protocol:
SMTP, Server Response: '550 5.1.1 Not our Customer', Port: 587, Secure(SSL):
No, Server Error: 550, Error Number: 0x800CCC79

What I don't understand either is that is an old
email and has been shut down so I am not sure why that is poping up.

The email address no longer exists.
Look in your Outbox folder and delete any old messages in there.

Gary VanderMolen, Microsoft MVP (Mail)


"B-man" wrote in message news6E4C094-3FB0-4444-BC1E-...

My email has been working fine all day and now it won't let me send anything
using WindowMail from Comcast.net.
This is my error can anyone help me please????????

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 ''. Subject 'Fw: [
Car AC Check]', Account: 'comcast.net', Server: 'smtp.comcast.net', Protocol:
SMTP, Server Response: '550 5.1.1 Not our Customer', Port: 587, Secure(SSL):
No, Server Error: 550, Error Number: 0x800CCC79

What I don't understand either is that is an old
email and has been shut down so I am not sure why that is poping up.