As noted previously, my main domain has been "spoofed" in the "from" address of a bunch of spam. Tonight I got several dozen identical "bounces" from yahoo Japan and I think they somehow broke my inbox ... suddenly I can't get any new mail (although there is new mail to get on the server) because it's telling me that it can't write to the mailbox, claiming that I either don't have permission (huh?) or that the disk is full (not by a long shot). I'm hoping that if I re-boot ThunderBird will re-set itself and I can get mail again.
I really, really, didn't need this sort of aggravation tonight.