> 
> ·         SMTP Listen Port (listenPort)<javascript:void(0);>
> (External IP and Internal IP)
> 
> ·         SMTP Destination (smtpDestination)<javascript:void(0);>
> (Internal Mail Server)
> 
> IN: Internet --> ASSP (IP External) --> ASSP (IP Internal) -->
> Internal Mail Server Out: Internal Mail Server --> ASSP (IP Internal)
> --> ASSP (IP External) --> Internet  ???

you should publish the ASSP relayport on the internal interface and
configure the internal mail server to connect to such a port for
outgoing email; but for this to work, you should also have an MTA
(SMTP) running on the ASSP box or on a separate one so that ASSP will
proxy outbound messages (coming through the relayport) to such an MTA
which will then proceed routing them to their destination

Basically the outbound flow will be somewhat like this

Internal mailserver
|
ASSP relayport
|
SMTP relay
|
the internet (target MX)

 

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