> > the most cited response is to deliver mail to the users home dir
> > 
> > or you apply quotas for users on the mail partition itself.
> 
> I just set up quotas for /var, but it didn't help.  I guess the mail
> is delivered by a root process which doesn't care about quota limits.

I made this "work" a long time ago at athena on 4.2bsd..

As I recall, you need to fix mail.local to:

 - do the write as the user, not as root, so quotas are
enforced.

 - return a sensible error code when a user is over quota (I had it
return EX_TEMPFAIL; others might be more brutal).

					- Bill