PREUN

/bin/sh

if [ "$1" = "0" ]; then if [[ -f /usr/share/info/msmtp.info.lzma ]];then /sbin/install-info /usr/share/info/msmtp.info.lzma --dir=/usr/share/info/dir --remove ;fi; fi 
if [ $1 = 0 ]; then
        update-alternatives --remove sendmail-command /usr/bin/msmtp
fi

POSTIN

/bin/sh

if [[ -f /usr/share/info/msmtp.info.lzma ]];then /sbin/install-info /usr/share/info/msmtp.info.lzma --dir=/usr/share/info/dir;fi 
update-alternatives \
	--install /usr/sbin/sendmail sendmail-command /usr/bin/msmtp 5 \
	--slave /usr/lib/sendmail sendmail-command-in_libdir /usr/bin/msmtp