If Pending and Welcome email aren't configured (subject and body empty) then they won't send. If they are configured then they will send and they will send to the user registering (they're not moderator emails). It's possible they're receiving the Joomla registration email, which you can disable by reviewing the below topic.
The above should only happen when created in backend though. Also check Extensions > Plug-in Manager > User - Joomla! and ensure "Notification Mail to User" is set to "No".
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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