Hey there,
Based on what we checked on your site, something is strange even your site doesn't send out user registration activation link to the new user who register on your site.
This is what i tested on your site :
1. Temporary disable these plugins so I can able to register a new user account through prior Joomla registration form.
- System - Payplans
- System - Easysocial
2. Switch "New user account activation" this setting from administrator to self
http://take.ms/qZZPE , so it will send user activation link to the new registered user.
3. Then manually access this Joomla registration page :
[gist type="php"]
http://www.ncagg.org/index.php?option=com_users&view=registration
[/gist]
4. Once I click submit, it will show me this message "Your account has been created and an activation link has been sent to the email address you entered. Note that you must activate the account by selecting the activation link when you get the email before you can login." , you can check my attached screenshot below.
5. Then I wait for 5 ~ 10 minute, I still unable to receive any email notification for this user account activation.
I suspect something is not right for your site PHP Mail, perhaps you can consider switch to use SMTP mailer and see how it goes? But for this SMTP setup, you have to contact with your webhosting provider regarding this and see whether they got provide you a webmail server regarding this.