Leave the list
One press and your address is off Reverie's mailing list. No account, no sign-in, no reason needed.
Done. You are off the list.
Nothing further will be sent to that address. If you have a Reverie account it is untouched — this was only the mailing list, and anything you need to be told about your own account still reaches you.
What we hold and why is on the privacy page. To have the record itself deleted rather than marked, email and ask — it is done by hand, by the one person here.