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Trying to send e-mails to this domain I receive this error. All the others work fine.
Is it something that should interest the recipient server or I'm missing something in the configuration of my smtp?
Thanks in advance to who can help me.

Reporting-MTA: dns; FLIMAIL
Arrival-Date: Fri, 29 Apr 2011 10:48:49 -0400

Original-Recipient: *****<_at_>**********.com
Final-Recipient: rfc822;****<_at_>**********.com
Action: failed
Status: 5.1.8
Diagnostic-Code: SMTP; 550 Access denied - Invalid HELO name (See RFC2821

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Do as the reject message says; check out RFC2821, section
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