For some reason, Yuri suddenly decided that admin@AnimeMusicVideos.org isn't a valid email address (no idea why, it doesn't even handle @AnimeMusicVideos.org mail). It has been resolved now.
However, I remember last time email brokeness happened it resulted in the forum getting really messed up summary statistics and we had fun with e.g., missing pages of posts.
If it happens this time, tell me and I'll perform the summary rebuild.
edit: Yuri == Yuri.AnimeMusicVideos.org == web/db server