sendmail turns _ in login names into a space

[Guy Harris]

> Description:
> 	We have login names for our uucp neighbours of the form u_host
> 	(e.g. u_utzoo).  sendmail thinks underscores should be turned
> 	into spaces before looking up login names in the password file
> 	and consequently never found such login names.
> ...
> Fix:
> 	This fix makes sendmail leave underscores alone.  (Eric, get away
> 	from that airplane glue!)

"And 6000 tubes of airplane glue!"  -- L. Bruce (6000 may not be the exact
number)

The 4.2BSD (and, I think, V7 and possibly S3, but definitely not S5) "login"
turned *spaces* in the logname into *underscores*, but why the hell
"sendmail" should turn them *back* escapes me.  No need even to protect that
crock with "#ifdef notdef" - it's just plain *wrong*.

	Guy Harris

"Don't want to do it without the fez on" - S. Dan