Q. What does it do ??
A. A JavaScript alert box pops up on clicking of "Complete Registration" button letting them know, that an activation mail will dispatch on successful registration and that they do not forget to check their BULK folder.
Q. Do I need this ?? A. Many website owners complaint that their mails are sent to BULK/SPAM folder of Yahoo/Gmail and others. And thus, the newly registered members keep waiting for the mail to arrive in their Inbox, keeping them unactivated for long.
So, I wanted to give them an immediate prompt on registration asking them to check their BULK folder for the Activation Mail and also mark it as NO SPAM.
Believe me, this has helped me a lot in getting my new members activated instantly.
Check this out:-
Immediate Alert notification of Activation Mail dispatch - vBulletin.org Forum 
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