I would like to set up a mail server in a DMZ that would accept mail only from those clients who have authenticated using SSL. Given that they have successfully passed that criteria, then this DMZ mail server would pass the mail off to an internal mail server for further delivery.
Thanks for any input!
In the esmtpd configuration file set the following variables:
AUTH_REQUIRED=1
and
ESMTP_TLS_REQUIRED=1
This will force all SMTP clients to establish an encrypted connection, and after an encryption connections provide a valid userid and password before accepting any mail from the client.
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