Hello Udo,

Thank you for reaching out to us.

1.Unfortunately, there is currently no such option with Amelia's built-in features. You can suggest that feature on the following link: https://features.wpamelia.com/ 

We carefully follow suggestions from our customers and the more votes the feature gets, the more priority we put on implementing that feature in one of the future updates. 

2.All Amelia's users are saved in the database, and databases don't allow multiple users to have the same email.

The only way you can do this is through the database, so you'd need to navigate to the wp_amelia_users table (please note that wp_ is the default database prefix, but on your end, it could be anything, so look for your_prefix_amelia_users table). Then, go to the Structure of that table, and drop the "email" index:

After that, go back to the table (click on "Browse" in the top left of the screen above), and manually change the email addresses of all your "providers". You cannot do this from within Amelia, though, so if you were to add a new employee, you would need to save that employee with a dummy email address, then navigate back to wp_amelia_users and change his email in the database.