I'm not sure how your hosting is set up, but email registrations can be a huge pain. If your forums are related to your server and you have the ability to manipulate your phpbb install, you can validate the client IP address against your server's account IP's.
A user just has to log in to the server once and then register from the same IP.
Relevant phpbb file: www/includes/ucp/ucp_register.php
You can select the ip out of account_ip or make a web-accessible script on your emu server that does it, then you just use fopen to get the result.
You might not need it if your host has a reputable IP, but for emu servers in particular I think it's a good alternative confirmation.
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