/usr/sbin/imapfront-auth
/usr/sbin/mailfront
/usr/sbin/pop3front-auth
/usr/sbin/pop3front-maildir
/usr/sbin/qmqpfront-echo
/usr/sbin/qmqpfront-qmail
/usr/sbin/qmtpfront-echo
/usr/sbin/qmtpfront-qmail
/usr/sbin/smtpfront-echo
/usr/sbin/smtpfront-qmail
You may install this package on Debian with
apt-get
install mailfront