There is a problem with this mod, take a look at your logs and the registrations it allows through, it's allowing email addresses that are not email addresses, i've had loads of spammers get through and they are supplying email addresses like "xYrkS", "nMWDZj"..........etc and many many more like it, i had turned of email confirmation as it can be a bit hit and miss but i've had to turn it on now