[Mimedefang] How to trap this spam

[David F. Skoll]

On Wed, 7 Jan 2004, Martin J. Dellwo wrote:

> I have a similar situation, and our ISP is a secondary for good
> reason--no good for me to house the secondaries if our connection to the
> ISP goes down!  Anyway, I would guess from the above conversation that
> doing greylisting is pointless for me?  I tried it briefly, and found
> that there was no impact on spam, many things come in through the
> secondary, and the ISP reported that unusually high volumes of mail were
> queuing on the secondary.

That's probably because you were greylisting your own secondary MX host.
You need to specifically exempt them from greylisting.

> Is there a benefit to greylisting in any
> situation where secondary MX machines are used?

Yes; I think it can still have some benefit, although not nearly as great
as when all MX hosts cooperate to do greylisting.

Regards,

David.