In some cases you want your wordpress users to login with their email address instead of the username. To do this, you can use a good plugin like 『WP Email Login』 or you can activate a 『Register Plus Redux』 plugin』s option, but when the users will ask for lost password, the old / original username will be emailed to them, and this can cause confusion. To avoid this situation, just install and activate Login Email Sync, and it will sync the username ( user_login database field ) with the email ( user_email database field ) every time a user updates her/his profile.
If you find this plugin useful, please rate it.
