Host/Domain Aliases can't be saved from gui email parameters
Real quick history of this raq that I inherited admin of.. old admin 'accidentally' deleted /usr/local and never had backups.. I had to recreate those directories to get some basic stuff working..
Also the first entry in the Host/Domain Aliases is preceded by an @.
All of this makes me think that somehow the backend database is corrupted as the domain with the @ symbol is the one giving me the problem and is properly setup in local-host-names and virtusertable. As far as the configurations I can see from the shell I can't find a problem to fix.
I wish I could help you
I'd advise having a good search on this forum plus the one on rackshack.. you might get lucky
There's also the cobalt users mailing list archive and the bulletin boards on the Sun Cobalt site.