Bonjour à tous , j'espère que vous allez bien !
je suis nouveau sur le forum alors j'espère que j'ai rien oublié avant de demander de l'aide 
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Alors voilà , j'ai un petit soucis de configuration avec postfix et dovecot que je n'arrive pas à résoudre,
dès que je me connecte sur un compte mail via Rainloop j'obtiens en log :
Jun 12 17:17:29 mx1 dovecot: imap-login: Login: user=<user@site>, method=PLAIN, rip=192.168.1.254, lip=192.168.1.5, mpid=2023, TLS, session=<Mztt6SGLGpzAqAH+>
Jun 12 17:17:29 mx1 dovecot: imap(user@site): Logged out in=11 out=422
Jun 12 17:17:30 mx1 dovecot: imap-login: Login: user=<user@site>, method=PLAIN, rip=192.168.1.254, lip=192.168.1.5, mpid=2024, TLS, session=<CBZ76SGLHJzAqAH+>
Jun 12 17:17:30 mx1 dovecot: imap(user@site): Logged out in=80 out=1676Je reçois correctement les mails de l'extérieur mais il m'est impossible d'en envoyer ...
mon doveconf -n :
# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.16 (fed8554)
# OS: Linux 4.9.0-9-686-pae i686 Debian 9.9 ext4
auth_mechanisms = plain login
disable_plaintext_auth = no
first_valid_uid = 2222
last_valid_uid = 2222
listen = *
mail_gid = 2222
mail_location = maildir:/var/vmail/%d/%n/mail
mail_privileged_group = vmail
mail_uid = 2222
maildir_stat_dirs = yes
namespace inbox {
inbox = yes
location =
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Junk {
auto = subscribe
special_use = \Junk
}
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox "Sent Messages" {
auto = subscribe
special_use = \Sent
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
prefix =
}
passdb {
args = scheme=SHA1 /etc/dovecot/passwd
driver = passwd-file
}
protocols = imap lmtp
service auth-worker {
user = vmail
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
unix_listener auth-userdb {
group = vmail
mode = 0600
user = vmail
}
user = dovecot
}
service imap-login {
inet_listener imap {
port = 143
}
inet_listener imaps {
port = 993
ssl = yes
}
service_count = 0
}
service lmtp {
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0600
user = postfix
}
}
ssl = required
ssl_cert = </etc/ssl/certs/mailserver.crt
ssl_cipher_list = ALL:!aNULL:!eNULL:!LOW:!MEDIUM:!EXP:!RC2:!RC4:!DES:!3DES:!MD5:!PSK:!SRP:!DSS:!AECDH:!ADH:@STRENGTH
ssl_dh_parameters_length = 2048
ssl_key = # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
userdb {
args = uid=2222 gid=2222 home=/var/vmail/%d/%n allow_all_users=yes
driver = static
}et mon postconf -n :
alias_database = $alias_maps
alias_maps = hash:/etc/postfix/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
compatibility_level = 2
data_directory = /var/lib/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = all
inet_protocols = ipv4
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mynetworks = 127.0.0.0/8
newaliases_path = /usr/bin/newaliases.postfix
proxy_interfaces = xx.xx.xx.xx
queue_directory = /var/spool/postfix
readme_directory = no
relay_domains = *
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname $mail_name (RisingCorp. Mail)
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_path = /var/spool/postfix/private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = $smtpd_sasl_security_options
smtpd_sasl_type = dovecot
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
unknown_local_recipient_reject_code = 550
virtual_alias_maps = hash:/etc/postfix/vmail_aliases
virtual_gid_maps = static:2222
virtual_mailbox_base = /var/vmail
virtual_mailbox_domains = hash:/etc/postfix/vmail_domains
virtual_mailbox_maps = hash:/etc/postfix/vmail_mailbox
virtual_minimum_uid = 2222
virtual_transport = lmtp:unix:private/dovecot-lmtp
virtual_uid_maps = static:2222J'utilise des comptes virtuels pour gérer plusieurs domaines ...
Je vous remerci d'avance pour toute aide ou suggestion car j'ai le cerveau qui fume depuis 1 semaine XD!
la distribution est affiché dans le doveconf -n si ça peut aider ... 
, je vais essayé d'être plus clair sur mon réseau en simplifié :
.)
:
est que quelqu'un peut me confirmer que c'est sur le serveur DNS en DMZ que je dois ouvrir le port 465 ? 
.