Add wildcard support for spamgourmet addresses
Spamgourmet.com allows a user to create disposable email addresses on the fly. That way a unique email address can be used for each web site you sign up for. The structure of an address is identifier[.##].email@example.com, where the identifier can change per site and [.##] is an optional max number of emails you want to receive. Because a different address is used for each site it is currently impossible to query HIBP for breaches of all sub-addresses, like *.firstname.lastname@example.org. Allowing wildcard search and notification for spamgourmet addresses (or its many alias domains) would enable users to check on any of their disposable addresses.
JoeBloggs probably uses email@example.com for linked in and firstname.lastname@example.org for facbook. In fact, Joe probably doesn't even remember all the email addresses of this form he has given out.
Not quite sure what you are suggesting.