There was a previous post about using the drop-down menu as a contact email list while hiding the email address for security.
[select* contact 'Contact 1|Contact1@example.com' 'Contact 2|Contact2@deckrenuga.com' 'Contact 3|Contact3@deckrenuga.com']
then plugging in [contact] into the "To:" field of the Mail form.
I have been trying to do the same except with a List ID instead of an email address and putting it into the "List ID" field of the Campaign Monitor menu.
[select* contact 'Contact 1|Key ID 1 ' 'Contact 2|Key ID 2' 'Contact 3|Key ID 3']
Any input would be helpful.