Mail delivery failed: returning message to sender

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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:
[email protected] host mx.mel.iprimus.com.au [203.134.153.81] SMTP error from remote mail server after initial connection: 554 mx686.mel.oss-core.net