We are able to send and receive messages however this error message pops up every time.  Can we stop this from happening??

The message could not be sent. The setting for your outgoing email [SMTP] server might need to be configured. To find the server settings for '*** Email address is removed for privacy ***', please contact your email service provider.

Subject 'Fw: Cancellation Confirmation Unique Pools & Spas 3047842  '
Server Error: 550
Server Response: 550 5.1.1 <*** Email address is removed for privacy ***> Recipient is invalid - ERR011
Server: 'smtp10.bellnet.ca'
Windows Live Mail Error ID: 0x800CCC79
Protocol: SMTP
Port: 25
Secure(SSL): No