i have small problem any body can resolve

i have vpopmail installed working fine.
iam trying to connect my isp and get mails and send mails are working fine.
iam trying to connect out side any ips and try to send a message iam getting
following error

any help will appriciate

The message could not be sent because one of the recipients was rejected by
the server. The rejected e-mail address was
'[EMAIL PROTECTED]'. Subject 'test obt', Account: '[EMAIL PROTECTED]',
Server: 'mail.xxyy.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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