4/6     /var/mail almost full.
        \_ Thanks for pointing this out.  It turns out quotas weren't
           enabled on /var/mail, and one user had 15G of mail.  I've
           enabled on /var/mail, and one user had 16G of mail.  I've
           reenabled quotas and truncated the large mailspool, and
           everything seems to be working now.  --mconst