I have one post that's over a year old, but still very popular. It gets comments regularly, but as of June 10 I'm not receiving notification of new comments. The comments appear on the site, and they appear in the admin panel as approved comments. I am listed as the author. I continue to receive comment notification emails for all recently written posts. I have checked the spam filters in Thunderbird and Gmail, which both receive the email notifications, and haven't found these comments there. I turned off spam filtering at my webhost's Cpanel. I don't know what else to check. If this were a problem with database corruption, what table would I look in, and what would I look for?