WordPress is not sending me comment notification emails. If a comment is held in moderation, I receive an email ("Please moderate: [post title]"), but if the comment is not held in moderation or after I approve a comment from moderation, I do not get a notification email.
I just discovered this so I'm not positive which of the plugins may have caused it. It may also be related to a recent upgrade to 3.1.2. Will be deactivating plugins.
Even if you don't know what might be causing it, I would appreciate it if you have any ideas of more specific terminology or whatnot that I should search under to find a solution!