General Wiki Announcements can misbehave because spaces
|Reported by:||Vlad-Mihai Sima||Owned by:|
If in the "Preference" > "Announcements" > "General Wiki Announcements" edit box you type something like "* <enter>" (notice the space), there will be nothing matched.
This can be very frustrating and no obvious for users. I would suggest either use strip function on each line, some kind of warning, or a partial list of matched wiki pages. Anything that would hint about what is the problem when you do not receive emails.