switch of registration verification

Give this a try if you like. Disable wp new user notification

Once you test it on WP 3.1.4, you might want to jump back to the plugin page and leave a vote for “works” or “Broken” in the plugin compatibility box for your version of wordpress.

Short of that, I think the function you want to do a keyword search on is “wp_new_user_notification”. A plugin solution would be optimal, but a code edit isn’t out of the question if you mind your updates and backups.

plugin search results: new user notification