Comment Moderation

In the Comment Moderation section, you can set options to specify what
types of comments are held in the moderation queue to await your approval.

To prevent spammers from spamming your blog with a ton of links, enter a
number in the Hold a Comment in the Queue If It Contains X or More Links
text box. The default number of links allowed is two. Try that setting, and
if you find that you’re getting a lot of spam comments that contain links,
consider dropping that number down to 1, or even 0, to prevent those
comments from being published on your blog. Sometimes, legitimate com-
menters will include a link or two in the body of their comment; after a com-
menter is marked as approved, she is no longer affected by this method of
spam protection.
The large text box in the Comment Moderation section lets you type key-
words, URLs, e-mail addresses, and IP addresses so that if they appear in
comments, you want to hold those comments in the moderation queue for
your approval.