[Moin-user] undeliverable "page changed" emails

[Jim Popovitch]

Forgive me if this has been discussed and I missed it.  I've got a wiki
that has some "stale" members who are still subscribed to various pages.
They no longer remember their passwords, they may not work for the same
company/email, and they want me to remove the notifications they are
getting from wiki page changes. :-)

What's the quick and dirty way to achieve this (without affecting normal
users)?

Thanks,

-Jim P.