How many of your friends play this little game? I’ve been banging the encryption drum with respect to email for years to little effect. Nearly all of my friends are technical and none of them want to bother with encryption in the slightest. That makes the use of encryption really stand out. And if the person on the other end won’t play, well...
Unencrypted email has all of the privacy of a postcard. Anybody who has access to any of the many machines that handle the mail can read it with ease.
Three with two more on rare occasions Like anything interest waxes and wanes depending on boredom levels