Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  user@domain.com
    host cluster5.us.messagelabs.com [216.82.250.51]
    SMTP error from remote mail server after initial connection:
    501 Connection rejected by policy [7.7] 10804, please visit www.messagelabs.com/support for more details about this error message.user@domain.com
    host cluster5.us.messagelabs.com [216.82.250.51]
    SMTP error from remote mail server after initial connection:
    501 Connection rejected by policy [7.7] 10804, please visit www.messagelabs.com/support for more details about this error message.

Reporting-MTA: dns; altar30.supremepanel30.com

Action: failed
Final-Recipient: rfc822;user@domain.com
Status: 5.0.0
Remote-MTA: dns; cluster5.us.messagelabs.com
Diagnostic-Code: smtp; 501 Connection rejected by policy [7.7] 10804, please visit www.messagelabs.com/support for more details about this error message.

Action: failed
Final-Recipient: rfc822;user@domain.com
Status: 5.0.0
Remote-MTA: dns; cluster5.us.messagelabs.com
Diagnostic-Code: smtp; 501 Connection rejected by policy [7.7] 10804, please visit www.messagelabs.com/support for more details about this error message.

Our Server IPs are:

198.23.60.180

198.23.61.195

Thank you

Rahmat Shah Masror