David Hulsebus:
> > Probably better is to only offer AUTH on submission port 587 with
> > required encryption, and not offer AUTH at all on port 25. 
> 
> That is exactly what I want to do. If I uncomment this in the master.cf does
> it force TLS encryption on port 587 before authentication? If not, how would
> I do that?
> 
> submission inet n       -       -       -       -       smtpd
>   -o smtpd_tls_security_level=encrypt
>   -o smtpd_sasl_auth_enable=yes
>   -o smtpd_client_restrictions=permit_sasl_authenticated,reject
>   -o milter_macro_daemon_name=ORIGINATING

http://www.postfix.org/SASL_README.html#server_sasl_enable
http://www.postfix.org/postconf.5.html#smtpd_sasl_auth_enable

http://www.postfix.org/TLS_README.html#server_tls
http://www.postfix.org/postconf.5.html#smtpd_tls_auth_only
http://www.postfix.org/postconf.5.html#smtpd_tls_security_level

> Further, how do I not allow AUTH on port 25. I can't glean it from the docs.

http://www.postfix.org/SASL_README.html#server_sasl_enable

        Wietse

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