Did you get an email error message that looked like this...
The message could not be sent because one of the recipients
was rejected by the server. The rejected e-mail address was '<email
address>'. Subject '<Test>', Account: '<Test>', Server:
'<smtp.example.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.
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