I went back to our logs from the last outage. We had 100+ users rejected during the downtime with the same message:
Code:
Spam-O-Matic Tagged email - *****@****.com Unable to connect to StopForumSpam.com. This is probably due to some temporary problems on their website: Unable to check. User passed to vBulletin registration system per your settings at 'StopForumSpam: Q
If this is an uncommon issue (I've only seen one downtime since I started using it), then I'll live with it. A really nice safety feature would be an email notification when the API stops responding.