This is the script that should be used to finalize list creation.
Living alongside with the list managers, Postfix should feed it (pipe)
with emails to mklist+{mailman,schleuder}@lists.fripost.org .

The email's body must have the following format:

  listname
  admin
  password

Also, the email should have a valid GPG-signature. The list of GPG
fingerprints allowed to create lists can be found in the configuration
file.

Upon GPG-verification, the script orders the list manager to create a
new list with the given credentials, and updates the LDAP directory
(removes the 'pending' status and adds list commands entries).