Only one name in email for customer w/ multiple contacts

Only one name in email for customer w/ multiple contacts

If you are sending an email to multiple contacts, how can we do it so that all the contacts' first names will appear in the template?

Example:
Contact 1 = Mickey Mouse
Contact 2 = Bugs Bunny

Template contains: Hello ${Contacts.First Name}

${Contacts.First Name} should be replaced with "Mickey & Bugs", but is only being replaced with "Mickey".