How to stop receiving spam comments?

If you have a WordPress blog, you will receive lots of spam comments, it is a constant battle dealing with them.
You might turn off from your dashboard getting comments, but robots will find a way to submit spam comments to your site. Just remember that even if you completely disable comments, spammers can still submit spam to your website. Always manually control your comments, under discussion you’ll find all of options WordPress commenting. Also, there are a few good plugins you might use.

Simple, lightweight yet effective spam comment blocker for WordPress.
Sets a cookie on a random URL that is then checked when a comment is posted. If the cookie is missing the comment is marked as spam.
Akismet checks your comments against the Akismet web service to see if they look like spam or not.