sudo apt-get install heirloom-mailx
sudo vi /etc/ssmtp/ssmtp.conf
mailhub=smtp.gmail.com:587
hostname=my-domain.com
rewriteDomain=my-domain.com
FromLineOverride=YES
AuthUser=???@gmail.com
AuthPass=???
UseSTARTTLS=YES

#!/bin/sh -x
sender='send@domain.com'
recipient='recipient@domain.com'
zipfile="results/file.zip"
today=`date +%d-%m-%Y`
mailSubject='My subject on the '$today
mailBody=$(cat <<-EOM
Les résultats de la fiabilisation des données du $today sont dans le fichier zip.

My-Company
EOM
)
echo $mailBody | mail -s "$mailSubject" -r "My Company <$sender>" -S replyto="$sender" -a $zipfile $recipient

05 12 * * * /home/.../script.sh

/home/.../script.sh > logs/script.log 2>&1

+ mail -s My subject -r My Company <???@my-domain.com> -S replyto=???@my-domain.com -a /home/.../results/file.zip ???@my-domain.com