Feature Request: Update contact email when sending email

I often have contacts without email addresses. I often customize the email then realize I haven't entered their email, forcing me to exit out of the email form, update the contact, save the text and come back to the email template. Sometimes, we've entered the email directly into the template which creates a separate entry for that user. This can be confusing since the system then doesn't allow updating the original prospect's email since because the email is a duplicate.