I have been trying to set up Live Mail and have been receiving one error message after another.

I am now able to receive messages but  not send them. 

The error message I receive is:

The message could not be sent because the server rejected the sender's email address. The sender's email address was '*** Email address is removed for privacy ***'.

Subject 'This a test'
Server Error: 550
Server Response: 550 This is a submission only port. You must authenticate before sending mail
Server: 'mail.dohmencapital.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): No

Please help!!

Thanks,

Rita