@dennygalindo That is a great question, Recently Yahoo hit the news when they admitted to being hacked into, and agencies like NSA and GCHQ are always trying to collect everyone's information.
Best advice is to stay away from the corporations Like Google & Microsoft, they all have backdoors and sell your info to 3rd parties.One of the best I’ve seen for Encryption and Free to use is proton mail https://protonmail.com/
Would be great if we could Up Vote this, so Everyone can see it.