Hacker News Reader

Most "non-tech" people I know use Outlook.

OS X's mail handles PGP just fine with the GPG Mail plugin from the GPG Suite.

Which is now a paid upgrade.

The source is still published and you can build it from source without paying.

I highly doubt non-techie people will want to (or be able to) find the source, install the deps, compile and install it though.

It's not free and is a third party tool developed from reverse engineering apple mail...

Everyone uses Outlook or Gmail for businesses.

The most popular email client is outlook. If you don't know that you are already pretty detached from reality.

Also Outlook does not support e-mail encryption out of the box.

It's amazing you had to use a throwaway just to make that statement.

So I was correct. Thanks. Indeed outlook is the first desktop client in your list.