ubluit exists

[Guy Harris]

>I can't give you any answers, but I have turned up an interesting
>clue.  I happened to run strings on /usr/ucb/mail on my Sun 3/50 (BSD
>4.2, Sun 3.5.2) today and what should appear in the output but
>*ubluit*!

"ubluit" appears to be the user name used by "Mail"/"mailx" if it can't
find a user name for the current user ID any other way - for instance,
if "/etc/passwd" can't be read, and, at least in the S5R3 version, the
LOGNAME environment variable isn't set.  Given that the file system
seemed to be in the process of being eaten by moths, that might explain
this.