Why do I get accidental comments without (the required) email address?
Pingbacks/Trackbacks: This is most likely a harmless case of link notifications to your blog (A) from the other blog (B), where: the comment_author_email field is usually empty, the comment_type field is either pingback or trackback, the comment_author field has the form: The title of the post that contains a link to a post of blog … Read more