Re: [exim] Queueing-issue when greylisted....

> > Imagine queue-runs every 15 minutes.
> >
> > 0m: Mail from a to b arrives and is greylisted =temporary error.
> > 14m: Mail from c to b arrives and is greylisted.
>
> Are you sure? With the default configuration, the fact that b
> had a temporary error should prevent further delivery
> attempts to b until its retry time has come. So if the retry
> time for b is 15m, there will be no delivery attempt for the
> second message when it arrives.
>
> This area of logic is notoriously complicated, so the only
> way to be absolutely sure would be be set up a test and check it out.

Even if this were the case, the very next email into the system (after retry
expires) with a different pair of addresses would trigger a new retry
period. Some emails may be delivered, but there is the potential for emails
to stay in the queue.

My only solution to this was to make these domains "queue only" and have a
queue runner that runs every 10 minutes. At least this would give you more
chance of processing older messages before an unknown pair blocks the host
again.

-Andy-