In the near future we'll be releasing a small improvement to email sharing for your customers viewing their photos. Until now customers have only been able to enter one email address at a time.
With this update they'll be able to enter as multiple email addresses at the same time. In addition, they can also add a personal message to the email.
This will make it easier for guests to share to their friends and families by email, and allow them to provide more context to the email they're sending.