Here's how to remove binmail from your system. Don't do this if you have configured qmail to use binmail for local delivery.
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Find the binmail binary on your system: /usr/libexec/mail.local if that exists, otherwise /bin/mail.
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Remove permissions from the binmail binary:
# chmod 0 /usr/libexec/mail.local
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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.
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Comment out the comsat line in /etc/inetd.conf, and kill -HUP your inetd.