apt update && apt upgrade -y
apt install postfix dovecot-imapd dovecot-pop3d dovecot-lmtpd mailutils -y

cat > /etc/postfix/main.cf  << EOF
# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

smtpd_tls_security_level = may
smtp_tls_security_level = may

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = mail.f11.fr
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = f11.fr, ubuntu, localhost.localdomain, localhost
relayhost = 
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all


virtual_alias_domains = hash:/etc/postfix/virtual-domains
virtual_alias_maps = hash:/etc/postfix/virtual
enable_original_recipient = no

mynetworks = 127.0.0.0/8 192.168.0.0/16

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
EOF

echo "protocols = imap lmtp" >>  /etc/dovecot/dovecot.conf
echo "mail_location = maildir:~/Maildir" >>  /etc/dovecot/conf.d/10-mail.conf
 
echo "disable_plaintext_auth = yes"  >> /etc/dovecot/conf.d/10-auth.conf
echo "auth_mechanisms = plain login" >> /etc/dovecot/conf.d/10-auth.conf

echo "mail.f11.fr" >> /etc/mailname

echo "f11.fr  # domaine" >> /etc/postfix/virtual-domains

systemctl restart postfix
systemctl restart dovecot

cat >> /etc/postfix/master.cf << EOF
submission inet n       -       y       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
EOF

echo Lire la fin du script pour faire fonctionner
exit 
-> Attention la fin du fichier dovecot doit être

#!include auth-deny.conf.ext
#!include auth-master.conf.ext

!include auth-system.conf.ext
#!include auth-sql.conf.ext
#!include auth-ldap.conf.ext
#!include auth-passwdfile.conf.ext
#!include auth-checkpassword.conf.ext
#!include auth-static.conf.ext
#
disable_plaintext_auth = yes
auth_mechanisms = plain login
#!include auth-passwdfile.conf.ext


# users 
user=jf
useradd $user
mkdir -p /home/$user ;  chown ${user}.  ${user}
maildirmake.dovecot /home/${user}/Maildir
cd /home/$user && chown -R ${user}.  ${user}