Galaxy x5 Multiple email icons

[AC Question]

I have three email icons 1) Email with red @ symbol 2) Gmail and 3) Inbox (envelope). Can't recall how I got all three nor if I actually need them? Should I be using only one choice to connect to and receive all email addresses?

 

[DrinkeeCrow]

The red @ symbol is Samsung's Email app
Inbox was pre Android M when google switched the standard email app over to Gmail.

Short answer, just use Gmail ditch the rest.