I am writing this review so that hopefully it will assist others in figuring out the best app for their task. I downloaded the iPhone pro version which works equally as well on the iPad. I have an iPhone 5 and iPad 2 with 8.1 iOS installed. For clarity, you can add multiple people from your contacts list one at a time to send out a mass email, but the problem with Mail it doesnt without some onerous steps allow you to create a group email list by name, add the respective email recipients to your group email and keep them for future or repeated use. This is where MailShot Pro comes in handy. It basically does all the work for you by scanning you contacts list it allows you to create and name a group email and then add, delete and rearrange emails in your group. Once, you are done hit update go to Mail and select the name of your Group email and you are ready to send your email blast.
FooledMeOnce about MailShot Pro- Group Email