@kimapr it’s like saying “if the recipient has PGP configured”.
The amount of people having set it up, including large hosting providers (assuming people use their apps / web interface), is barely existent and mostly in the cyber security and enthusiast space from what I’ve seen.
And it’s Google we are talking about. The deprecation timeline starts on release day. “Statistics show there are no external s/mime recipients, so we are focusing on our own client you’ll have to use moving forward”