When enabled, customer upon signup will receive nicely formatted email verification message with a link, that once visited will enable his account.
Until customer account is enabled he will not be able to do anything in his account after login, unless his account will be verified trough email. He will be presented with info prompt to enter verification code as shown on screenshot:
Administrators can see whether customer profile was verified or not in top shelf menu of customer details page:
This module is part of Cloud Signup module, it can also be purchased separately. After downloading it from HostBill licenses client portal, extract module archive in main HostBill directory.
Proceed to Settings → Modules, find and activate Email Verification plugin
In Settings → Modules → Plugins → Email Verification you can set some configuration values: