Do contributors need to create an account to add a message?
No, contributors do not need to create a Thankbox account in order to leave a message on a Thankbox.
They can optionally enter their email address with their message. They will then be sent a link with which to edit their message. They'll also be notified when the recipient replies to their Thankbox after receiving it.
If adding to a gift collection then the email address is mandatory so we can email them a receipt.