The SMTP 554 error can happen when a server rejects email sent from a specific domain. The best solution is to resend email from a Yahoo, Hotmail, or GMail account notifying the recipient of the problem.
Example of Error Response:
Final-Recipient: rfc822; <**@**.com>
Action: failed
Status: 5.0.0 554_:_Client_host_rejected:_Access_denied
Diagnostic-Code: smtp; Permanent Failure: Other undefined Status
Last-Attempt-Date: Fri, 18 Aug 2006 19:32:20 -0000
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