Allow sending messages to a user (self-)defined email address on the template message level. So on the template message level, there should be a dropdown to send the message to “guest” or “user defined email address”. This would allow further processing of the message, for example sending it via SMS or WhatsApp to the guests phone number by using third party or self-developed services. Also this could bridge the gap (omnichannel) between multiple tools which handle guest messaging but lack for example of SMS or WhatsApp.