I'm using WP 2.7 and version 1.13 of the DMSGuestbook plugin. I have tried both the graphical and numerical anti-spam feature and neither works well at all. I am deleting 12 or more spam e-mail addresses every day for a small poetry blog I created for my elderly father. While the spammers never seem to be able to post anything with their newly created accounts, they still force me to delete their username/password account info every day to keep the guestbook clean.
Based on my experience, the math captcha in DMSGuestbook is too easy and the graphical version not much better. Also, I see no easy way to blacklist an entire domain. For example, most of the spam is coming from places like "*.ru", "*.gmail" and "*.ua".
Would it be possible for the plug-in's author to create a timed auto-delete feature in the plug-in, so that any newly created account which does not have a post within a user specified time is automatically deleted from the DMSGuestbook?
If this problem can be fixed, please tell me how.