A bit OT: strange spikes in RBL-blocked connections

[Ronny T. Lampert]

Hi all,

best list to ask: for quite a while now I see strange spikes in 
RBL-blocked connections:

Everything is fine with around 10-30 blocks/minute.
Then suddenly at 10AM (GMT+1) they shoot up to 80-100/minute. They fall 
back a bit until 2PM.
Around 2PM when they shoot up again to even higher levels and gently 
fall down until 4-5PM to their levels before 10AM.

Anybody else noticed that?

Cheers,
Ronny