We found a small bug in the Akismet plugin under WordPress 1.5 that would cause it to throw errors when you tried to mark something as “not spam” and submit it as a false positive.
If you’ve had this problem, please download the latest version of the plugin (1.06) and let us know if that fixes the problem for you.
Akismet 
Thank you, for me it fixed the problem.
thanks, the fix works.
I’m having trouble with Akismet persistently trapping a certain commenter. I must have marked 20-30 of his comments as “not spam” by now, but it keeps trapping him. Is there any way to set up a “white list” of commenters (by email address perhaps) so that I can prevent this?
Happy to say the fix worked for me too 🙂
Well Robert, that’s exactly my question, but the ‘certain commenter’ in my case is me. I cannot comment anymore at my own site without Akismet thinking it’s spam. This is because a while ago, I posted a comment containing several links. It’s getting so irritating that I disabled Akismet until there is a fix for this.
Robert and Jan, if you submit the falsely caught comment as “not spam” then the system learns from that and corrects the error over time. If it doesn’t then it is likely that you’re being caught by something that isn’t Akismet.
Matt, I’ve disabled all my other spam defences, and Akismet works brilliantly apart from this problem — it just doesn’t seem to learn that this fellow is not spam!
The same goes for me.
Jan, Robert: how about using Spam Karma with its Akismet Plugin. Best of both worlds and Spam Karma has whitelists AND never marks comments from a logged in person as spam.
Ha ha! Spam on the Akismet blog!
Sorry, I was testing some things out and forgot about that
🙂
Just so you know — it’s finally learned that he’s not a spammer!