/usr/sbin/alternatives \
    --install /usr/sbin/sendmail mta /usr/sbin/sendmail.postfix.exe 0 \
    --slave /usr/lib/sendmail mta-sendmail /usr/sbin/sendmail.postfix.exe \
    --slave /usr/bin/mailq mta-mailq /usr/sbin/sendmail.postfix.exe \
    --slave /usr/bin/newaliases mta-newaliases /usr/sbin/sendmail.postfix.exe \
    --slave /usr/share/man/man1/sendmail.1.gz mta-sendmail-man /usr/share/man/man1/sendmail.postfix.1.gz \
    --slave /usr/share/man/man1/mailq.1.gz mta-mailq-man /usr/share/man/man1/sendmail.postfix.1.gz \
    --slave /usr/share/man/man1/newaliases.1.gz mta-newaliases-man /usr/share/man/man1/sendmail.postfix.1.gz

/usr/sbin/alternatives --set mta /usr/sbin/sendmail.postfix.exe