Duplicates filter when sending emails.

I’ts quite usual for us that user duplicates is created in Intercom. But PLEASE make it possible to sort out duplicates by email address. There can’t be a single person who needs the same email, to the same email address at the same time. 

Just give us an option to avoid duplicates when setting an email live “send to each email address once” or something like that instead of sending to each user as a standard.