How to add PGP support on Android for added security and privacy
Briefly

"Encryption ensures the emails I send to specific recipients can only be read by those with a matching key to decrypt the contents of the email."
"For encryption in email, you'll require a different email client, as Gmail won't cut it. I prefer Thunderbird on Android because it's an outstanding email client, works with PGP.."
Read at ZDNET
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