Email Error that reads something like this:
"The rejected e-mail address was 'firstname.lastname@example.org'. Subject 'SUBJECT LINE HERE', Account: 'YOUR ACCOUNT NAME', Server: 'mail.yourdomain.com', Protocol: SMTP, Server Response: '553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)', Port: 25, Secure(SSL): No, Server Error: 553, Error Number: 0x800CCC79"
You simply need to check the following settings in your email program:
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