Where has the spam gone?!

[#1]

So I normally get a a steady trickle of junk emails in my spam email address, having been caught by the F9 spam filter. But recently... nothing. Now either all the nasty spammers out there are taking January off or something odd is happening. (Not that I especially want to wade through the spam but every now and again a genuine email ends up in there.)

Has anyone else noticed this?

[#2]

Nope.  I've had 37 spam emails today (made it to my inbox unchallenged),   and 11 false positives (genuine emails marked as spam). 
Just another Tuesday with Greenby. 

[#3]

I did have a few that evaded the filter but that's (probably) irrelevant. There's still nothing in my spam mailbox. There's almost* certainly something amiss.

*Almost because I can't prove a negative. But it's extermely unlikely no-one's sent me any spam for weeks. I think the filter is throwing them away rather than delivering them to my spam box.

[#4]

Well, an email has trickled in (sadly not from Mrs. Trellis). But it is odd, I normally have far more junk than one email in 3 or 4 weeks.