This option uses the inbuilt Mystic BBS text editor to open and edit bademail.txt

This file allows you to set a list of email addresses that are not allowed to be entered by a user when setting their email address. Entries are case insensitive and wildcards are permitted.

Below is a screenshot of the Mystic editor in action.

                          File: c:\mystic\data\bademail.txt
  ; BADEMAIL.TXT
  ; ============
  ; This file contains a list of bad e-mail addresses that are not allowed to be
  ; entered by a user when setting their e-mail address.  The list should contain
  ; a single e-mail address per line and can include a * wildcard.  Lines that
  ; are blank or begin with a semi-colon are considered comments.
  
  *whitehouse.gov