The Shared E-mail module overrides the 'user' module's validation, that prevents the same e-mail address being used by more than one user.
Works for both registration and account updates.
Displays a warning to the user that they are using a shared email.
Based on Allowing Multiple Accounts from the Same E-Mail Address?
All this module does is remove the unique constraint for the email using a hook.
None.
Install as usual, see Installing contributed modules for further information.
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Navigate to settings form through
Admin > Configuration > People > Shared E-Mail Settingsor directly at path
/admin/config/people/shared-email