Apologies for the late reply. Long story short, our external email servers become a victim of a blackmail DDOS attack. The forum software wasn't able to communicate with the email server, email delivery failed. The attack stops now, so you should be able to request and receive confirmation emails now. I've tested it.
As of now if the forum software couldn't be able to communicate with the external email server, it will drop the email and will not retry the delivery. I know this is an awful setup and there is a planned improvement for the email delivery system.
In the next upgrade, our email setup will two fail-over email servers: We will have a minimum of two email server spanned across the continents all of which will have some commercial anti-DDOS solution enabled. Regarding email delivery: The system will automatically queue and retry the delivery to the fail-over servers for [X] amount of times within Y amount of minutes before dropping the emails. X and Y value will be reasonable. For example 100 times, 5 minutes each for every failure.
Please reply to this thread whether or not you receive the confirmation email.