BTW, tried this stunnel setup from
With both 465 and this 11125 port. Neither one worked. Both ports are open in iptables:
telnet localhost 11125
telnet: Unable to connect to remote host: Connection refused
A minimal stunnel.conf file is sufficient to set up a tunnel from local port 11125 to the remote destination "mail.example.com" and port "smtps". Postfix will later use this tunnel to connect to the remote server.
accept = 11125
client = yes
connect = mail.example.com:smtps
To test this tunnel, use:
$ telnet localhost 11125
This should produce the greeting from the remote SMTP server at mail.example.com.
On the Postfix side, the relayhost feature sends all remote mail through the local stunnel listener on port 11125:
relayhost = [127.0.0.1]:11125