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From: Wietse Venema on 7 Jan 2010 09:11
Michael:
> On Fri, 08 Jan 2010 00:50:49 Wietse Venema wrote:
> > Michael:
> > > I want to deploy a system whereby it will do an SQL lookup and depending
> > > on the result will either continue processing the message as per usual or
> > > issue a 'temporary' reject (Ie: Over quota message).
> > >
> > > This is on a relaying/gateway machine so it does not have direct access
> > > to the mail queue to do it's own calculation so would need to work it out
> > > based on information available from an SQL table.
> >
> > Pointers:
> >
> > A) Use an SQL-based access table that is queried at SMTP time:
> > http://www.postfix.org/access.5.html
> > http://www.postfix.org/mysql_table.5.html
> >
> > B) Use a policy server that queries the database and does the calculation:
> > http://www.postfix.org/SMTPD_POLICY_README.html
>
> Thanks Wietse.
>
> What I was thinking of doing was using check_recipient_access
>
> Will a 'NULL' result (ie: no rows returned) be treated as an OK?

The format of access map lookup results is documented in
the access(5) manual page:

http://www.postfix.org/access.5.html

This gives you the precise definition of all valid replies.

Wietse

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