No. Each Qwil user must be setup with unique secure email addresses.
If a workaround is required (for example a couple sharing one email account), Gmail, Hotmail, Outlook and some other email providers have capability to create aliases by adding a + symbol in the following way: Barbaralevy+1@gmail.com
Now these two emails are recorded as different on Qwil, however the +1 is ignored by the email provider, and the emails will be received for both addresses at Barbaralevy@gmail.com.
Check that this service is provided by your email host, if it is not named in this article, before attempting to do so.