In some projects, we need to give functionality to user can login with their email id. Now it is not a big deal in drupal. There is a module called Email Registration in drupal which is useful for this purpose. Email registration allow users to register and login using only an email address. Users can then log-in using their email address and password for authentication.

Step 1:

Download Email Registration

Go to sites\all\modules directory and extarct it.

Now go to admin/modules.

Find Email Registration and enable it.

Step 2:

Now time to check it.

So log out first

Go to your login page and give your email in username field and password in password field.