Gnanasekaran Loganathan

Activation mail sent to the new user email once a user registered. The user must activate the account by click activation link in addition to a username and password to log in successfully the first time.
This plugin does not currently work with multi-site. Multi-site uses an activation key system for new registrations already.

User Activation By Email

Require users to click the activation link to access the site which is emailed upon user registration.

shawfactor

All this plugin does is is change the buddypress signup activation process such that:
When signed up user activates their account, it makes them logged in
Once that user is logged in, they are redirected to their profile
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LH Buddypress login on activation

Makes your buddypress signup process seamless by automatically logging on users who activate their account.

User Activation By Email vs LH Buddypress login on activation