I am getting error messages.

[Neil]

I am getting these error messages, why? How do I fix them? How do I get rid
of them?
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 '(e-mail address removed)'. Subject
'Your Quote', Account: 'mail.access-security.ca', Server:
'smtp1.ns.sympatico.ca', Protocol: SMTP, Server Response: '550 Invalid
recipient: <[email protected]>', Port: 25, Secure(SSL): No,
Server Error: 550, Error Number: 0x800CCC79

 

[mac]

I am getting these error messages, why? How do I fix them? How do I get rid
of them?
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 '(e-mail address removed)'.
Subject
'Your Quote', Account: 'mail.access-security.ca', Server:
'smtp1.ns.sympatico.ca', Protocol: SMTP, Server Response: '550 Invalid
recipient: <[email protected]>', Port: 25, Secure(SSL):
No,
Server Error: 550, Error Number: 0x800CCC79

The email address is not correct (e-mail address removed)

You also posted this error elsewhere a short while ago:

The rejected e-mail address was 'bartonconstruction@newsgroup'. Subject
'Your Quote', Account: 'mail.access-security.ca', Server:
'smtp1.ns.sympatico.ca', Protocol: SMTP, Server Response: '550 Invalid
recipient: <bartonconstruction@newsgroup>', Port: 25, Secure(SSL): No,
Server Error: 550, Error Number: 0x800CCC79

What are you trying to do?