Mina Azer wrote:
> can anybody please map the mail flow on all three port 25, 587, 465

I let ASSP listen on port 25 for regular email transfer, and port 26 
(local IP 127.0.0.1) for relaying. And the MTA (Exim in this case) is 
listening on ports 465 and 587 for email submissions and 24 (local IP 
127.0.0.1) for relaying.

A user can submit email only on port 465 or 587 of the MTA and the MTA 
will submit it to ASSP on port 26 (mostly to take care of whitelisting), 
then after processing ASSP will submit all email received on port 26 to 
the MTA's local IP (127.0.0.1) on port 24. The MTA has been configured 
to send out all emails it receives on port 24 as normal.

When ASSP receives email on port 25 it will submit it to the MTA on port 
  24 (local IP 127.0.0.1) then the MTA will deal with it.

So in ASSP it is configured like this:
SMTP Listen Port        25
SMTP Destination        127.0.0.1:24
Relay Host              127.0.0.1:24
Relay Port              127.0.0.1:26

The MTA and ASSP are on the same server. The MTA can either send 
incoming email to another MTA which servers as the mailstore 
(imap/pop3), or the mailstore can be on the same server. That just 
depends on how many servers you want to involve. At home I have it all 
on 1 server (including imap, bind, webmail and what have you), at other 
occasions I configured, say, 3 ASSP/MTA servers and 1 mailstore with an 
MTA/Imap/pop3 etc.

Best regards,
Jeroen

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