Simple, start using SSL.
Edit: seems like they just do a POST request to an old URL (http://blog.tuinslak.org/some-post), which results in this reply:
HTTP/1.1 301 Moved Permanently Server: nginx/0.9.4 Date: Tue, 22 Feb 2011 07:10:24 GMT Content-Type: text/html Content-Length: 184 Connection: close Location: https://blog.tuinslak.org/
I’m guessing once they rescan the new URLs they’ll be spamming again. Just a matter of time for them to update their “bookmarks”. 😉
Anyway, here’s the Akismet screenshot:
Pretty cool, no ?
Totals can be found here.