Error message with outgoing server Help pls

[Nancy]

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 'jethomas_pan@yahoo'. Subject 'Just a note',
Account: 'Windows Mail', Server: 'mail.npgcable.com', Protocol: SMTP, Server
Response: '504 5.5.2 <jethomas_pan@yahoo>: Recipient address rejected: need
fully-qualified address', Port: 25, Secure(SSL): No, Server Error: 504, Error
Number: 0x800CCC79

using Windows Vista.

 

[Dave]

Revise that recipient's email address to include the ".com" at the end.

 

[mac]

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 'jethomas_pan@yahoo'. Subject 'Just a
note',
Account: 'Windows Mail', Server: 'mail.npgcable.com', Protocol: SMTP,
Server
Response: '504 5.5.2 <jethomas_pan@yahoo>: Recipient address rejected:
need
fully-qualified address', Port: 25, Secure(SSL): No, Server Error: 504,
Error
Number: 0x800CCC79

using Windows Vista.

Change the email address that you are sending to, to (e-mail address removed)