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smtp-listener 1.2.3.4:465 tls=yes
smtp-server-tls-certificate /etc/pmta/certificate-generated-by-openssl.pem "YourPasswordHere" smtp-server-tls-ciphers "HIGH:MEDIUM:!ADH:@STRENGTH"
<source 0/0> # matches all
allow-starttls yes
require-starttls-before-auth yes
allow-unencrypted-plain-auth no
</source>