Re: [exim] Still a noob, but slowly improving. Greylisting …

I can see this, but what about hosts that ignore MX records and
just connect direct?


On Tue, May 17, 2005 at 01:26:37PM -0700, John W. Baxter wrote:
> On 5/17/05 12:53 PM, "Jaye Mathisen" <mrcpu@???> wrote:
>
> > I've been reading on greylisting, and thinking about integrating
> > it.
> >
> > However, one question sticks in my head, if you authenticate auser via
> > some SMTP-AUTH method, then is grey-listing bypassed?
> Not an issue here, as the Exim instances that customers talk to are separate
> from the MX that the world talks to.
>
> >
> > I was also thinking about going to really short intervals. Like 5 minutes.
>
> We use a Python daemon we wrote here (which tracks using a MySQL database).
> Exim gets a simple ACCEPT or DEFER back from the daemon, and acts
> accordingly. (Mostly at RCTP TO: time, but we defer the <> sender and some
> others to DATA time for greylisting (to avoid issues with those doing
> callbacks), and we have whitelisting in a database with fairly fine-grained
> control (not quite fine enough, unfortunately)).
>
> Keeps a lot of messages out of our system (including the new Sober), and the
> drivel that the machines infected with the new Sober are now spewing out.
>
> A process runs every 5 minutes to clean up the database.
>
> The separate daemon is much easier than trying to make Exim make the
> decisions.
>
> --John
>
>
>
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