File: /var/lib/qmail/doc/REMOVE.binmail
Here's how to remove binmail from your system. Don't do this if you have
configured qmail to use binmail for local delivery.
1. Find the binmail binary on your system: /usr/libexec/mail.local if
that exists, otherwise /bin/mail.
2. Remove permissions from the binmail binary:
# chmod 0 /usr/libexec/mail.local
3. If the binmail binary was /bin/mail, make sure that ``mail'' still
invokes a usable mailer. Under SVR4 you may want to link mail to
mailx.
4. Comment out the comsat line in /etc/inetd.conf, and kill -HUP your
inetd.