Luigi Cavalieri

RedBrick is able to block most of the automated spam comments a WordPress blog receives daily.
It is based upon a score system that ensures spam comments are blocked as soon as possible, so as to minimise the number of checks each comment must go through. When in doubt, RedBrick always holds the comment in the moderation queue. Comments identified as spam, however, never reach the database.
As a last resource in discerning the kind of comment under examination, RedBrick takes account also of the comment author’s history.
The plugin is designed to work on low-to-medium traffic blogs.

RedBrick

Simple anti-spam plugin for WordPress blogs.

Flector

The plugin sends you an email each time a comment goes to the spam folder. The plugin will come in handy in combination with anti-spam plugins like <a href="https://wordpress.org/plugins/antispam-bee/" rel="ugc">Antispam Bee</a>, <a href="https://wordpress.org/plugins/invisible-captcha/" rel="ugc">Invisible Captcha</a> and others that completely filter out comments from bots. It saves you the trouble of having to visit the “Spam” folder and manually check whether any real comments have been marked as spam by mistake.
We don’t recommend installing this plugin if you use <a href="https://wordpress.org/plugins/akismet/" rel="ugc">Akismet</a> only – you’ll be drowned in hundreds of emails every day.
If you liked my plugin, please rate it.

Spam Notifier

The plugin sends an email message when a comment goes to the spam folder.

RedBrick vs Spam Notifier