From: Dan Burkland (dburklanNMDP.ORG)
Date: Fri Jun 04 2010 - 15:21:06 CDT

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Hello all,

I have been trying to setup my Postfix server as follows:

a) Clients need to use STARTTLS + Authentication in order to send mail using my SMTP Server. They can only submit mail on port 587 (25 for submission is disallowed).
b) Port 25 is to be used for MTA-to-MTA communication and should still accept mail for all domains that my server is the final destination for.

I have attempted at setting this up however I am unable to send mail to external domains. I am now prevented from sending mail through 25 as designed and can still however send to myself (or other recipients that are hosted on my server). I would appreciate any insight regarding my goal as previously described.

Relevant configuration entries:

-------main.cf--------
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination

-------master.cf-------
submission inet n - n - - smtpd
        -o smtpd_enforce_tls=yes
        -o smtpd_sasl_auth_enable=yes
        -o smtpd_sasl_type=dovecot
        -o smtpd_sasl_path=private/auth
        -o smtpd_client_restrictions_permit_sasl_authenticated,reject

Any insight is greatly appreciated!

Thanks again,

Dan

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