Hackerone is not properly deleting user id

How it was found

Summary: Long ago, i had an account on hackerone that is now deleted. I used the alias email provided by h1 to sigbup on a site for bug testing. To my surprise, i receive an email to my account routed from an alias email that should not exist.

Description:

Steps To Reproduce

1. SignUp on H1
2. Use h1 alias email to signup on some website
3. Delete h1 account and the email still exists

Optional: Your Environment (Browser version, Device, etc)

Optional: Supporting Material/References (Screenshots)

• as you can see.the email i just received. You can check your database that █████ dont exist in your database coz I deleted the account long back..but you can see the email address .

███████

Impact

Privacy concern