Erasure
Everything held for one email address, and the one way to remove it. The contact form promises a message can be deleted on request and the privacy notice promises Article 17; this is where that gets carried out.
It cannot reach the copies that were emailed. Those are shown on every answer below, because an erasure that reported "done" while a copy sat in a mailbox would be a lie.
What is held for
Contact messages
Account
Copies this cannot reach
Counted page views are not in scope and cannot be: a view carries a visitor number and no address, so nothing here could find the ones belonging to this person. That number is erased from every row 30 days after the view.
Erase
Deletes the contact messages, the stored profile and the sign-in account for this address. It crosses three stores, there is no undo, and nothing here can recreate the account.
About to delete .
Type the address out to confirm; the field refuses a paste. It is the only address this will act on, and typing it is the last chance to notice it is the wrong one.