A great news for WordPress users. Few minutes ago Akismet 2.2.5 was released. Now you can catch the spam comments in more better way.
In this release, Akismet Included a new Server Connectivity diagnostic check, which will help you to detect problems caused by firewalls.
Akismet explains more about it as:
The new Server Connectivity diagnostic feature detects problems caused by firewall or security software on some web hosts. If a web hosting company or server administrator blocks connections to Akismet.com, the Akismet plugin will be impaired or stop working altogether. The diagnostic feature will detect this and provide information that the web host can use to update their firewall to enable Akismet.
Hope you will update to it asap. to Fight against Spam Comments more properly.