Mail System Error - Returned Mail

This Message was undeliverable due to the following reason:

Each of the following recipients was rejected by a remote mail server.
The reasons given by the server are included to help you determine why
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    Recipient: <pamgreene_at_ozemail.com.au>
    Reason: #5.1.1 bad address pamgreene_at_ozemail.com.au

Please reply to <Postmaster_at_mx.bigpond.com>
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The following attachments have been removed from the bounce message: pamgreene_at_ozemail.com.au.zip

attached mail follows:

The original message was received at Wed, 20 Dec 2006 18:28:09 +1100
from handhelds.org [30.223.225.78]

----- The following addresses had permanent fatal errors -----
pamgreene_at_ozemail.com.au