>Internet mails -> Postfix-1 (SMTP Gateway) -> ASSP (SMTP Proxy) ->
Postfix-2
This is a NOT recommended mail flow. Why? Because Postfix-1 has to
generate at least one (possibly more) NDR for every mail that is blocked
by ASSP.
Such a mail flow may be used, if ALL mails are delivered and are only
tagged by assp.
If a company uses such a mail flow and the company is commited to keep
conversations for revisioning, the company has to archive and to keep all
mails received be "postfix-1"! Because this host has accepted the mail.
Generating a NDR, because a mail was blocked by assp (in this mail flow)
does not extricate the company from archiving the mail - even it is 100%
spam!
Only if the company does NOT accept (means reject using 5xx 4xx) a mail at
the first entry point, it is extricated from archiving, because the mail
was never received.
Because this sounds logic - there will be a similar regulation in nearly
every country (don't know about Vietnam).
BUT ALL germans are warned - this is LAW in Germany!
Instead use:
Internet mails -> ASSP (SMTP Proxy) -> Postfix
This flow uses the advantage of assp's proxy mode. If ASSP blocks a mail
and drops a connection - nobody and no system at local location has to
care about NDR's and bounces beause of NDR's.
Thomas
Von: Nguyen Nang Thang <than...@iwayvietnam.com>
An: For Users of ASSP <assp-user@lists.sourceforge.net>
Datum: 25.01.2016 08:26
Betreff: Re: [Assp-user] ASSP Support Domain-based Email Routing?
----- Original Message -----
> From: "Thomas Eckardt" <thomas.ecka...@thockar.com>
> To: "For Users of ASSP" <assp-user@lists.sourceforge.net>
> Sent: Monday, January 25, 2016 12:30:11 PM
> Subject: Re: [Assp-user] ASSP Support Domain-based Email Routing?
>>I'm wondering if ASSP has a feature called "domain-based email routing".
>
> in short - NO.
>
> Why? Because ASSP is a proxy not a mail server.
>
> Internet mails <-> ASSP (SMTP Proxy) <-> Email Server
>
> This not only shows the mail flow - it also shows the IP connections.
How
> should switch assp the IP connection to another mail server in the
middle
> of the SMTP handshake (after RCPT TO) or even more hard to do - after
the
> mail header (TO:) is received? In this example the "Email Server" has to
> do the "domain-based email routing" to "Email Server1","Email Server2","
> Email ServerX".
Thomas:
Thanks for your detailed explanation.
I'd like to share my success ASSP deployment that has the feature
"domain-based email routing":
Inbound Connection:
Internet mails -> Postfix-1 (SMTP Gateway) -> ASSP (SMTP Proxy) ->
Postfix-2 (domain-based email routing enabled) -> Email Server1/2
=> I use the feature "multi instance" of Postfix for the feature
"domain-based email routing", where as:
* Postfix-1 (primary instance): Accept all incoming messages from the
Internet, then route them to ASSP
* Postfix-2 (secondary instance): Used for ASSP as the SMTP destination
configured in ASSP
* Postfix and ASSP are running on same host on my System
Regards,
N. Thang
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