I, too, would like to see this added to the default main.cf file distributed by the postfix package. With this simple change, more servers would be using server-to-server encryption. Those whose setup require them to disable such opportunistic encryption can always change the value for smtp_tls_security_level.
(sorry to revive this old issue, but it's such a simple change and it hasn't recieved any love for so long) -- Gabriel Filion
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