Plugin to reject spam. Port from same author from http://www.phpbbantispam.com
Actually visits the URL from commenter to spider for spamwords.
Plugin does a lot more such as (this list does not cover all antispam functions present):
* Count for number of web-URI's in comment
* Count on email, IP, URI compared with allready spammed comments
* Checks trackbacks and pingbacks for a valid IP adres (IP visitor must be same as webserver)
* Detailed information by email about the spammed comment. You can approve the comment later on, or blacklist the IP adres.
* Future feature: Add hidden fields with random names
Need PHP5 on your webserver. Does not work on PHP4 webservers.

Coding by: MijnPress.nl Twitter profile More plugins

1. 

   Settings admin GUI Fullscreen Screenshot 1
   

2. 

   Email notification Fullscreen Screenshot 2
   

1. Upload directory antispam-for-all-fields to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress.

0.8.3

Changed: txt file
Bugfix: preg_replace headers sent

0.8.2

Bugfix: division by zero (ajax) Added: 2nd run for word checking ..
Added: Refer check, thanks to: Antispam Extra V 0.2 By Budhiman

0.8.0

Bugfix: Wrong param order for spamword check, sorry!! Changed: Update msg only shows in backend

0.7.9

Added: IP whois link in email to admin Added: Incorporated "No comments without proper HTTP referer" by "Antispam Extra V 0.2 By Budhiman"
Changed: string_is_spam function
Added: Useragent spam check

0.7.8

Added: Lots of (more then 25%) dots in mail and free-email

0.7.7

Added: Trackback and pingback stage 1, based on Simple trackback validation with topsy blocker Stage 1

0.7.6

Added: New spam definitions

0.7.5

Bugfix: Framework did not work on multisite, is_admin() problem.
If anyone could help me with that ? :)

0.7.1

Changed: Small settings check

0.7.0

Added: Upgrade manager
Added: Added new word to spamlist
Added: Stopforumspam IP and email check
Added: Protection against random website nofollow random etc. See source code for more info

0.6.9

Changed: Do not sent an email if IP is blacklisted
Changed: Do IP blacklist check first
Changed: IP blacklist now also checks for trackbacks and trackbacks
Added: Remove all records with same mail address OR same URL for this IP

0.6.8

"So fine I scipped a number"
Added: if IP-adress is present in your WordPress blacklist (see Settings -> Discussion -> Blacklist), reject comment from that IP-adress
Added: if IP-adress is present in your WordPress blacklist, prevent double enties

0.6.6

Bugfix: used $this instead of $afaf object for IP purposes, sorry!

0.6.5

Added: nice wp-die message if a comment is held for moderation
Changed: if you blacklist an IP adress, also delete the comment

0.6

Bugfix: Private function instead of protected, causing the wordlist to halt on error

0.5.2

Bugfix: Limit bug (array)..

0.5.1

Bugfix: Random nonce was given multiple times

0.5

Bugfix: Counter
Added: GUI, you can set thresholds and edit/add/delete spamwords to search for
Added: Mail with more details
Changed: Core file and admin_menu file
Added: Store comment for 7 days, email contains a link to approve comment or blacklist the IP adres

0.4

Bugfix: plugin_antispam_for_all_fields_stats for spammed stats
Added: Check for number of websites in comment, if above 10 then spam comment

0.3

Bugfix: forgot to report status, fix that will run once is included.
Fix triggers when a new comment is submitted.
Added counter
Changed wordlist a bit

0.2

Implemented visit of URL of commenter to spider for spamwords.

0.1

First release

I have a lot of questions and I want support where can I go?

http://pluginsupport.mijnpress.nl/ or drop me a tweet to notify me of your support topic over here.
I always check my tweets, so mention my name with @ramonfincken and your problem.