Preventing spam comments

WordPress Comment Moderation

One way to begin keeping tabs on comment spam is to turn on Comment Moderation in WordPress under "Settings > Discussion".  

This requires that all comments be approved by you, the site owner, before they will be published on the site. So this ensures that if comment spam does come to your site, you'll see it first and can delete, before it appears on the site.

WordPress Comment Blacklist

Also in the "Settings > Discussion" area is a Comment Blacklist field.

Here you can type in any words, names, e-mail addresses, IP addresses, etc that will prompt WordPress to automatically trash the comment for you. So if you continue to get comment spam from a particular user, you could input their e-mail address here. Or if you keep getting comment spam containing the word "pharmaceuticals" for example, just paste that into this field so that none of those comments make it through.

WordPress Anti-spam Plugins

Now if you are getting a ton of comment spam and the options mentioned above not helping, the best combatant would be a WordPress plugin. The best WordPress plugin we've found to deal with comment spam is called Akismet. This plugin has a free personal/hobby key, or a commercial key that costs $10 per month.

An alternative to Akismet are any number of free spam prevention plugins. Some have a captcha and some don't. A number of security plugins include anti-spam functionality, as well.

AKISMET

Step 1: Activate the Akismet Plugin

To start using Akismet, just log into your blog's admin area and, in the left-hand, main WordPress sidebar menu, go to "Plugins" » "Installed" and click the activate button in the Akismet plugin box.

Step 2: Get & Enter your Akismet API key

Next, you will need an Akismet API key to get Akismet working.

You have a few different options, depending on the type of site that you have. You will choose which option fits from the Akismet pricing page.

That's it! Akismet will catch pretty much all of your spam.

Step 3: (Optional) Discussion settings

Now that you've got Akismet running, we also recommend turning off comment moderation and notifications in your WordPress admin area. There's no need to manually moderate comments or be notified of spam when Akismet is doing all of the work for you. Just go to "Settings" > "Discussion" and uncheck the four boxes shown in the picture below.