[Mailman-Users] bounce message w/no discernable addresses

[Christopher Adams]

Can someone help me interpret exactly what this means?

Aug 27 09:31:08 2010 (14241) libs-or: bounce message w/no discernable
addresses: <4B77CBB77F52BF41BEE2C397760565BD0885365C at xxx.xxx.xxx.xx.local>
Aug 27 09:31:08 2010 (14241) libs-or: forwarding unrecognized, message-id:
<4B77CBB77F52BF41BEE2C397760565BD0885365C at xxx.xxx.xxx.xx.local>