Part of the problem is that his host is breaking source routes :(

>This delivery error is in a special format that allows software like
>LISTSERV to automatically take action on incorrect addresses; you can
>safely ignore the numeric codes.
>
>Note: delivery error converted to LMail format at UBVM.CC.BUFFALO.EDU.
>
>--> Error description:
>Error-For:  [log in to unmask]
>Error-Code: 3
>Error-Text: 553 <@UBVM.cc.buffalo.edu:[log in to unmask]>...
>551<?><@UBVM.cc.buffalo.edu.>:[log in to unmask]
>
>Error-End:  One error reported
>
>----------------- Original delivery error (before conversion) ----------------
>UBVM.cc.buffalo.edu unable to deliver following mail to recipient(s):
>    <[log in to unmask]>
>UBVM.cc.buffalo.edu received negative reply:
>553 <@UBVM.cc.buffalo.edu:[log in to unmask]>...
>551<?><@UBVM.cc.buffalo.edu.>:[log in to unmask]