Stopping spammers seems to be working.

[Mac]

Rick

I take it this is in place,

The last posting from your IP was less than 37 seconds ago. Please try again later.

to stop spammers, well it seems to be working.

Mac

[Rick]

I increased the minimum interval between posts a bit. (I suppose I should have chosen 42 seconds.) I can trim it down again if it's too irritatingly long, but I figured if mister whatsit from a few days back had had to wait a bit longer between posts we'd have seen a whole heap less of his fish and pork...