Add native mail encryption out of the box through the integration of pEp

**Background**
I think this (pEp) approach is the most comprehensive one to face the huge problem that online communication — for the most users out there — is visible like a postcard & that this world has mass surveillance. The solution would be mass encryption and mass anonymization for all users out there. But this has not been accomplished through PGP/OpenPGP/GPG for the past 30 years now. And this is where pEp approach steps in. It's neither just plain GPG/OpenPGP, nor does it use/is build upon Autocrypt. It handles OpenPGP and S/MIME without hassle for the user (pEp automatizes all the steps a user would need to carry out for a secure communication -> key management, key discovery, private key handling, next step here is key syncing), what has not been solved by integrating plain GPG in Clients functionality so far.

For developers it's very easy as you can just plug'n'play the engine, which means that you don't have to maintain any crypto. It's developed and financed by a swiss foundation, cooperative and company, has external code audits.

**Feature summary**
what it says on the tin!

I don't want to feel the need to install & use Thunderbird (cause pEp is provided there by Enigmail's default) just to make my communication on elementary OS more secure and sustainable.
This could be solved by adding privacy by design support for pEp in Mail.
Guess the pEp developement team would love to support your implementation if you just ask them!

**How would you like it to work?**
I would love to see it as an privacy by design and default enabled, build in plugin, that secures my future communication out of the box, after (installing &) running Mail as my primary Mail client.

**Relevant links, screenshots, etc**

Definitely a good place to start — for the code — is https://pep.foundation/pep-software/

Further I would recommend Sva's talk from last years FROSCON
https://media.ccc.de/v/froscon2018-2181-let_s_roll_out_mass_encryption
It contains everything you should know, about the concept, the technical side and provides links to all of their code & communication channels as well. There is a part about the difference to Autocrypt as well.

What are your thoughts on this?

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