I don't think such a thing when using a hang-out?
- I want to send an MMS, but it is troublesome is to copy from your contact book one by one.
- Not given subject. Can not be a new line.
- You need to open contact book and again when trying to send to multiple people.
For such a person,
It is an application that can create MMS message when you select Email address of contact book!
Just send the message that you create complete because it is copied to hangouts!