POSTIN
/bin/sh
# sendmail-alternatives update-alternatives --install /usr/sbin/sendmail sendmail-command /usr/bin/esmtp 20
POSTUN
/bin/sh
# sendmail-alternatives if [ "$1" = 0 ]; then update-alternatives --remove sendmail-command /usr/bin/esmtp fi
/bin/sh
# sendmail-alternatives update-alternatives --install /usr/sbin/sendmail sendmail-command /usr/bin/esmtp 20
/bin/sh
# sendmail-alternatives if [ "$1" = 0 ]; then update-alternatives --remove sendmail-command /usr/bin/esmtp fi