No. Features like "Forgot login" and "Lost username" prevent different users from sharing identical emails.

To manage a single email account, there are different options, each with its pros and cons:

1. create new and/or secondary email accounts for each user, and auto-forward emails from those new accounts to a single account;
2. use sub-addresses for each user :https://www.joomlapolis.com/news/18328-sharing-email-addresses-between-joomla-accounts (does not work with Yahoo/Rogers/Sympatico);
3. for Yahoo/Rogers/Sympatico, setup an alias or disposable address for your account : https://help.yahoo.com/kb/SLN16026.html