[Spambayes] x-lookup-ip extension

[skip at pobox.com]

    Matt> I'm very ready to believe that having the cache persist makes a
    Matt> lot of difference given how Skip uses it. 

Correct.  I run my train-to-exhaustion script which retrains on my entire
training database.  Not having the ip addresses cached to disk means that
runs slow every time.  I suspect the same would be true of any full-retrain
mechanism with x-lookup-ip enabled.  If you're just training or scoring on
individual messages or have a long-running process like the pop3 proxy that
keeps the cache alive in memory the incremental cost is probably not bad.

Skip