My mail server appears not to send encrypted mail.
It seems like most of the information/tutorials focus on setting up TLS so that a client can connect, which I believe I have achieved. I've learned that in the config file, SMTPD is mainly focused on receiving mail. I believe I'm missing some SMTP parameters, have tried a few, but no luck.
This is from my postconf - n:
alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no inet_interfaces = all inet_protocols = ipv4 mailbox_size_limit = 0 mydestination = localhost myhostname = xxxxxx.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = permit_sasl_authenticated permit_mynetworks reject_unauth_destination smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/letsencrypt/live/xxxxxxx/fullchain.pem smtpd_tls_key_file = /etc/letsencrypt/live/xxxxxxxx/privkey.pem smtpd_use_tls = yes virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf virtual_transport = lmtp:unix:private/dovecot-lmtp