Server is exchange 2000 on server 2000, child domain in the campus forest. Users account has [log in to unmask] set as primary with additional smtp addresses of [log in to unmask] and [log in to unmask] . User can send to some addresses @msu.edu but gets some returned with 'servername.ad.msu.edu #5.7.1 smtp:550 5.7.1 Unable to relay for [log in to unmask] Any ideas? Thanks - Michael