This is the message that I get when I try to send email:
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'firstname.lastname@example.org'. Subject 'Testing', Account: 'My Name', Server: 'smtp.charter.net', Protocol: SMTP, Server Response: '550 #5.1.0 Address rejected.', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79
My ISP--Charter--has verified that all email settings are correct. They said it is possible that another program is interfering. How can I find out what?
The only recent change I remember making is downloading Firefox; however, I had been using Firefox for several weeks before the email problem started.
Any help will be appreciated!