Spam Master is the Ultimate Spam Protection plugin that blocks new user registrations and post comments with Real Time anti-spam lists.
New beefed-up version for wordpress 3.8
At $25.00 it's pretty steep for spam protection when there are free ones out there.
The free version seems to be plug-n-play, no configuration. It says it's blocking me from "4 threats" but you can't see what those threats are. I don't know where it gets it's "spam list" from and looking at their website I don't think that information is available.
You can't create your own blacklist - which you can do with a couple of free plugins.
For the money they need to give you a lot more - and be very specific about how it works, where they get their spam list, how often it's updated, needs to show blocked registrations and you should have the ability of manually allowing a blocked registration by clicking an "approval" link.
This is the spam filters work in the corporate world - Barracuda, Spamstops here, etc…they block emails, you get a list of each one that was blocked and the ability to click on it and mark it "not spam".
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