MailScanner SMTP question

James Gray james at
Mon Mar 6 03:54:22 GMT 2006

On Monday 06 March 2006 14:19, Laurent Dinclaux wrote:
> Hello,
> I know I should buy the book and I certainly will, but I would like to
> know where is MailScanner "sitting" in a SMTP transaction.
> I mean, is MailScanner able to reject a mail at SMTP level, before
> downloading it and wasting bandwidth?

No.  Mailscanner sits between two MTA queues:

Internet -> Incoming MTA -> MailScanner -> Outgoing MTA

It's important to note the MTA's DON'T interact with each other or 
MailScanner.  All three processes operate independantly although all rely on 
each other.

Here's a better overview:

Specifically, look at Figure 2 on page 3.


List at least two alternate dates.
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