There have been some changes to the handling of email addresses.
1. Email addresses are now case insensitive. This means that demo(at)gmail(dot)com is the same as DeMo(at)gMaIL(dot)coM.
2. As a note, usernames and realnames are case sensitive. This means that Ima Person is not the same as ima person.
3. The FAQ (http://deankeith.org/notifier/faq.html (http://deankeith.org/notifier/faq.html)) has been updated to state the case sensitivity of usernames and realnames.