smtp_server=LE_SERVEUR_SMTP
;exemple : smtp.laposte.net / smtp.gmail.com

; smtp port (normally 25)

smtp_port=465

smtp_ssl=ssl

default_domain=localhost

auth_username=MAIL_D_ENVOI
auth_password=MOT_DE_PASSE

force_sender=MAIL_D_ENVOI

[mail function]
; For Win32 only.
; http://php.net/smtp
;SMTP = localhost
; http://php.net/smtp-port
;smtp_port = 25

; For Win32 only.
; http://php.net/sendmail-from
;sendmail_from ="[email protected]"

; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
sendmail_path = "C:\wamp64\serveur_mail\sendmail.exe"

apt-get install msmtp

mkdir /var/www/apache2-default
cd /var/www/apache2-default
nano .msmtprc

# Set default values for all following accounts.
defaults
auth           on
tls            on
tls_trust_file /etc/ssl/certs/ca-certificates.crt
logfile        ~/.msmtp.log

# Gmail
account        gmail
host           smtp.gmail.com
port           587
from           [email protected]
user           username
password       passwordUser

# A freemail service
account        freemail
host           smtp.freemail.example
port           587
from           [email protected]
user           username
password       passwordUser

# Set a default account
account default : gmail

chown www-data:www-data .msmtprc
chmod 600 .msmtprc

nano /etc/php/7.2/apache2/php.ini
sendmail_path = "/usr/bin/msmtp -t -C /var/www/apache2-default/.msmtprc"

systemctl restart apache2

cat /var/log/apache2/error.log