[exim] OT: The joy of mbox locking

Hello,

while hacking on some old code, I came across the fact, that if you
have two users "usera" and "usera.lock", typical systems with mail in
/var/mail/$USER won't be much fun, because the lockfile for the first
user has the same name as the mailbox of the second. It would have
been smarter to use ":lock" instead of ".lock" as suffix. Well,
that's Berkeley quality software for you.

But it sheds a new light onto removing old lock files. :-)

Michael