Eric B. wrote:
>> Changing the SMTP submit port to 587 (as per rfc2476 Section 3.1) for
>> your clients and using SSL/TLS on that would allow all Internet mail to
>> be scanned by ASSP and by routing outgoing email through ASSP would
>> allow it to work as it should. Only internal email is not seen by ASSP.
> 
> How would one configure ASSP to work for this?  I've been stuggling with 
> this notion for the last couple of days and can't figure out the right 
> setup.  The way I see it, I need to route all incoming mail on port 25 
> through ASSP before going to my mail server (ie: set Listen Port to 25 and 
> SMTP Destination to 225).  My mail server would be configured to listen on 
> port 225.
> 
> Now, you are suggesting to add port 587 on my mail server as an incoming 
> SSL/TLS port.  That's fine.  So email clients (ex: Outlook Express, etc) 
> would connect to port 587 and submit their mail.

Yes.
Anonymous email uses port 25.
Authenticated email uses 587.

> This is where i get stuck however.  How do I configure the mail server & 
> ASSP to process mail from this point?  I can configure the mail server to 
> use a relay server and route outgoing mail through another server/port, but 
> how would I configure ASSP to receive that connection and then transmit the 
> email to the world?

Sorry I was not clear in how I have that implemented.

My authenticated clients do not submit email through ASSP.
They use a non MX record server using SSL/TLS.
The server only accepts authenticated email no anonymous SMTP is allowed.

All Internet/externally bound email is routed through ASSP thus allowing 
the whitelist and email interface to function.

-------------------------------------
External Anonymous Email:

Server1A -> ASSP -> Server2A

External Auth Email:

Client -> Server2A

Outgoing Email:

Server2A -> ASSP -> Server2B -> Server1A


Server2A is the main MTA server.
Server2B is a smtp relay server between ASSP and any server on the Internet.
Server2B is not necessarily a separate physical box from the ASSP server.
Server1A is any server that sends my domain email.
-------------------------------------

> Furthermore, how does this protect any spammers from sending mail to port 
> 587 on my mail server destined for the local users of the mail server, 
> thereby bypassing ASSP completely?  Won't all the local users on the mail 
> server still get spammed?

Just deny anonymous email on 587.
I've never seen a spammer touch 587 though.



Kevin

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