das ist das einzige was ich mit TLS finden kann in der main.cf.
inet_protocols = ipv4, ipv6
mailbox_size_limit = 0
broken_sasl_auth_clients = yes
cyrus_sasl_config_path = /usr/syno/mailstation/etc
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_sasl_authenticated_header = yes
smtpd_tls_cert_file = /usr/syno/etc/ssl/ssl.crt/server.crt
smtpd_tls_key_file = /usr/syno/etc/ssl/ssl.key/server.key
smtpd_tls_security_level = may
# selfhost
relayhost = [mail.selfhost.de]
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/usr/syno/mailstation/etc/smtp_auth
smtp_sasl_security_options = noanonymous
smtp_use_tls =yes
smtp_enforce_tls =yes
smtp_tls_enforce_peername = no
inet_protocols = ipv4, ipv6
mailbox_size_limit = 0
broken_sasl_auth_clients = yes
cyrus_sasl_config_path = /usr/syno/mailstation/etc
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_sasl_authenticated_header = yes
smtpd_tls_cert_file = /usr/syno/etc/ssl/ssl.crt/server.crt
smtpd_tls_key_file = /usr/syno/etc/ssl/ssl.key/server.key
smtpd_tls_security_level = may
# selfhost
relayhost = [mail.selfhost.de]
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/usr/syno/mailstation/etc/smtp_auth
smtp_sasl_security_options = noanonymous
smtp_use_tls =yes
smtp_enforce_tls =yes
smtp_tls_enforce_peername = no