Comment 6 for bug 1786920

- The fix is to present the user with the
right web form that will tell him that his
address is blacklisted, and suggest what
to do next.
- The bug is to present the wrong/irrelevant
web form that just asks to re-type the valid
e-mail infinitely, not allowing to make any
progress.

(just repeated the main sentences in case
the long messages are not being read through)