Thank you so much for detailed replies.
I wish you be able to help a little more. I used

       25 - ASSP, SSL optional,  AUTH optional  - 225 - MTA
                  works with and without ssl
however
       587 - ASSP, SSL optional,  AUTH mandatory - 226 - MTA
                 error while sending mail responded 5.7.0 must issue a
starttls command first

I am sure the client is issuing the starttls because the logs said the following
assp mail log
Feb-3-09 16:44:34 45.45.45.45 <> client on port 587 issued STARTTLS -
converting to SSL
Feb-3-09 16:44:56 Admin connection from 165.230.171.45:38019; page:/maillog

 Thanks

On Mon, Feb 2, 2009 at 10:11 PM, J.R. Oldroyd <f...@opal.com> wrote:

> On Mon, 02 Feb 2009 18:29:04 -0800, Jeroen van Aart <jer...@mompl.net>
> wrote:
> >
> > 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
> >
> >
>
> Using 1.5.1.0 rc2 with SSL support, a simpler configuration is possible.
>
> ASSP listens on 25, 465 and 587.
> MTA listens on 225 and 226.
>
> ASSP's 25 and 465 are sent to the MTA's 225.  AUTH is optional here.
> ASSP's 587 is sent to the MTA's 226.  AUTH is required in this flow.
>
> This gives you:
>         25 - ASSP, SSL optional,  AUTH optional  - 225 - MTA
>        465 - ASSP, SSL mandatory, AUTH optional  - 225 - MTA
>        587 - ASSP, SSL optional,  AUTH mandatory - 226 - MTA
>
> Regards,
>         -jr
>
>
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