I' don't know your infrastructure, so I descripe my configuration:

For outside users I use the Port 587/tcp "submission".
In RFC 2476 it's definied for client-to-server communication with
authentification.


In the past I used  two possible ways on mta/assp site:

1. You define a portforwarding of port 587 to your assp. In assp you've to
specify:
   Second SMTP Listen Port (listenPort2) = 587
   Second SMTP Destination (smtpAuthServer) = [ip of your mta]:[port of the
second receive-connector]
  
  You can use optional parameters like "EnforceAuth" and "NoAUTHlistenPorts"

2. You define a portforwarding of port 587 directly to your mta. 
    The mta needs an 2nd listener for this port ( e.g. in exchange you have
an second receive-connector for this job)



If you use postfix google for "postfix submission".  
If your assp and postfix is on the same machine  you've to define a
different port at postfix master.cf:

Instead of 
        submission inet n - - - - smtpd
use 
        127.0.0.1:11587 inet n       -       -       -       -       smtpd.
in the master.cf and define 
        Second SMTP Destination (smtpAuthServer) = 127.0.0.1:11587



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