I’m almost of the opinion every one should include several, multiple in fact, key words designed to trigger the NSA and Obama’s minions to have to scan the email by human.
Inundate them with data they HAVE to assess manually.
I say this because I truly believe there is no encrypted communication that can be captured by the NSA that isn’t breakable.
Given enough effort, the NSA can break encryption one way or another. Keyloggers and improper use are two of the easier ways. It’s no big deal if there is a miniscule portion of the population using encryption. However, if millions are, then it’s far more difficult. Swamp them.
As for smart phones, never plan to own one.