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smtp-proxy/example.dovecot.conf

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# Dovecot SMTP submission proxy configuration (dovecot 2.4 syntax)
#
# Terminates SSL/TLS for the local hostname (e.g. smtp.example.com) and
# proxies every login, credentials included, to the destination server
# (e.g. smtp.example.net) over its own SSL/TLS. After the login succeeds,
# dovecot forwards the connection bit-by-bit in both directions.
dovecot_config_version = 2.4.0
dovecot_storage_version = 2.4.0
protocols = submission
log_path = /dev/stdout
ssl = yes
ssl_server_cert_file = /etc/dovecot/ssl/cert.pem
ssl_server_key_file = /etc/dovecot/ssl/key.pem
ssl_min_protocol = TLSv1.2
ssl_client_ca_file = /etc/ssl/certs/ca-certificates.crt
auth_mechanisms = plain login
service submission-login {
inet_listener submission {
port = 587
}
inet_listener submissions {
port = 465
ssl = yes
}
}
# Destination submission server. "ssl = yes" + port 465 = implicit TLS;
# for a STARTTLS destination use port 587 with "starttls = yes" instead
# of the ssl field.
passdb static {
fields {
nopassword = yes
proxy = yes
host = smtp.example.net
port = 465
ssl = yes
}
}