[Gross] perpetual match

Jesse Thompson jesse.thompson at doit.wisc.edu
Wed Nov 7 14:33:08 EET 2007

Eino Tuominen wrote:
> Jesse Thompson wrote:
>> Next, I checked the gross logs.  There were 0 Grey entries for these
>> IP addresses going back 30 days.   hmmm
> Check that you do have update = grey in config (it's the default).

It is

>> But why does it only happen to these few mailers?  Surely this would
>> be more random?
> It really is possible to have this kind of deterministic behaviour with
> bloom filters. Suppose you have a client that is constantly on some
> blocklist, and who regurarly sends email to the same recipient in your
> organization. The triplet is always the same and it always is present in
> your bloom filter. Suppose that these other triplets collide with the
> earlier triplet. The result is just what you are seeing.
>> Could this be leading to the bloom filter false positives?
> I'm afraid so.

How likely will raising the filter bits setting help?

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