Outlook is an email system, and I think you've gotten off the track looking into email anti-spam plugins.

I should have been way more specific. We're looking for a plugin for WordPress, something that, in this case, would look at each submitted post and comment and try to determine whether it's spam. The determination of spamishness should result in the message being held for a human to review, rather than automatic deletion.

Most but not all of the available plugins should be registered with WordPress and searchable in their catalog at http://wordpress.org/extend/plugins/. I think a plugin has to be free to get into the official catalog, so what you'd find searching elsewhere is likely to be commercial and require baksheesh.

Our minimum technical standard is that a plugin has to be tested to work with WordPress 3+. Other than that I'll have to judge each candidate on a case by case basis. Don't feel pressured to pick the perfect plugin right away. The most helpful thing you can do is winnow the list to a handful that look promising to you, and then let me check 'em out technically.

Thanks for taking this on, Eri. Sorry the first effort wasn't on-track, that's my fault for not briefing you before you set out on your quest. Please take a look at WordPress's catalog; I'll be interested to see what you find.