Since the massive spam attacks hit XF I installed XenUtiles. It worked great in stopping the spam on my board but I started receiving a lot of bounced emails to my default email address. So I changed the Bounced Email Address to "email@example.com" and the emails to the default address stopped. But I also noticed no registrations for awhile. I decided to test a registration. So I registered using a different email address. I never got the confirmation email. I requested a resend and still no email. So I removed the Bounced Email Address and requested it send again and I received the confirmation email immediately. I'm not sure why putting an address in the Bounced Email Address would have any bearing on sending confirmation emails. I'm now getting registrations again but once again getting the bounce notifications at the default address. I'm not sure if this has anything to do with XenUtiles as I have that installed. Also, I know it's not in a spam folder as I have no filtering.