For some reason both this blog and my GoodeValue.com blog have stopped sending me any sort of emails on August 8. They use different versions of WordPress and are both hosted at 1&1. Even changing from a PHP mail() function to SMTP did not help. Upgrading this blog to the newest WordPress version this afternoon (causing some downtime) did not help. If you have any suggestions please leave them as comments.
It seems like this was a server problem on my web host. All my websites were down for a bit this evening and afterward my website’s email function worked again.