You do not have permission to send to this receipient

I get the following error when an email is sent to this email address:
You do not have permission to send to this recipient.  For assistance, contact your system administrator.
 <MAIL.TMG-DC.COM #5.7.1 smtp;554 5.7.1 <USER@CLIENT>: Recipient address rejected: user USER@CLIENT  does not exist>
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flyingskyConnect With a Mentor Commented:
That's because the recipient's mail server reject your email. You need to find out why. Possible
1. address wrong (as indicated by the message, USER@CLIENt does not exist.
2. Some how your IP is blacklisted.
wjkingAuthor Commented:
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