Welcome to Comcast Help & Support Forums
Find solutions, share knowledge, and get answers from customers and experts

New to the Community? Start here.

Posted by
  • The Community would like to Welcome you!

Member Since: ‎12-30-2008
Posts: 1

Can't send email which is using windows mail

Here is the error message


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 'mikeevenson@comcast.net'. Subject 'email problems and research paper', Account: 'mail.comcast.net', Server: 'smtp.comcast.net', Protocol: SMTP, Server Response: '550 5.1.0 Authentication required', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78


Mike Evenson

Posted by
Email Expert

Member Since: ‎03-10-2004
Posts: 6,888

Re: Can't send email which is using windows mail

Please refer to the e-mail client settings detailed in this post and adjust your settings as necessary. Please make sure that you follow all of the steps for your particular e-mail client.


Posted by
Networking Expert

Member Since: ‎07-28-2003
Posts: 24,238

Re: Can't send email which is using windows mail

Pay particular attention to selecting the option "My outgoing server (SMTP) requires authentication". I would also recommend you change your SMTP port to 587 and turn on SSL.