How to enable E-mail Vertification in phpBB3
Enabling E-mail Vertification in phpBB3 is useful because a user have to have a real e-mail to use your forum by activating their account by clicking the activation link within an automated e-mail they will receive from your forum, so spambots can't posts on your forum if they did not vertify their e-mail.Turning on User E-mail activation in phpBB3's administrator panel reduces spam in most cases.
Step 1. Log into your admin. Control Panel.
Step2. Make sure you're in the general tab then click on the "user registration settings" on the left. Secondly, pick the "by user" option. Lastly, press submit.