I have been receiving this error:

An unknown error has occurred. Subject 'Emailing: reason west.jpg', Account:
'pop.charter.net', Server: 'smtp.charter.net', Protocol: SMTP, Server
Response: '550 Message identified as SPAM - Please visit
http://www.charter.com/postmaster', Port: 25, Secure(SSL): No, Server Error:
550, Error Number: 0x800CCC69

Charter says I am not blocked and is encouraging me to use there mail server
online. They say they can't help me with this because they are not
associated with outlook, and they believe this is outlook express error? Can
anyone help me with this?

Thanks