Installer ce qui est nécessaire :\\
apt install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules \\

Dans **/etc/postfix/main.cf :** \\

__**modifier :**__ \\

relayhost = \\
en\\
relayhost = [smtp.gmail.com]:587 \\

mydestination = $myhostname, jmanson.fr, srv-pve2.jmanson.lan, localhost.jmanson.lan, localhost \\
en\\
mydestination = mon@mail.fr\\

myhostname=srv-pve1.jmanson.lan \\
en\\
myhostname=mon.smtp.fr\\

__**ajouter :**__ \\
canonical_maps = hash:/etc/postfix/canonical \\
smtp_sasl_auth_enable = yes \\
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd \\
smtp_sasl_security_options = noanonymous \\
smtp_tls_CAfile = /etc/postfix/cacert.pem \\
smtp_use_tls = yes \\

**modifier /etc/aliases :** \\
postmaster: mon@mail.fr \\
nobody: mon@mail.fr \\
hostmaster: mon@mail.fr \\
webmaster: mon@mail.fr \\
www: mon@mail.fr \\
root: mon@mail.fr \\

Créer  ** /etc/postfix/canonical** \\
root@mondomaine.fr mon@mail.fr \\

créer **/etc/postfix/sasl_passwd** \\
[smtp.gmail.com]:587 USERNAME@gmail.com:MDP_mail \\

**lancer les commandes suivantes** : \\
chmod 400 /etc/postfix/sasl_passwd \\
postmap /etc/postfix/sasl_passwd \\
postmap /etc/postfix/canonical \\
newaliases \\
cd /etc/ssl/certs \\
openssl req -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout key-for-smtp-gmail.pem -out cert-for-smtp-gmail.pem \\
cat /etc/ssl/certs/cert-for-smtp-gmail.pem | tee -a /etc/postfix/cacert.pem \\
/etc/init.d/postfix restart \\


**tester :** \\
echo "Test mail from postfix" | mail -s "Test Postfix" adresse@mail.com \\

**sources :** \\
https://www.it-connect.fr/configurer-postfix-pour-envoyer-des-mails-avec-gmail/ \\
https://forum.ubuntu-fr.org/viewtopic.php?id=1047711 \\