I use MacGPG to sign commits on GitHub but I have to admit that the E-mail portion has fallen by the wayside. (The last time I really used it was to E-mail a professor of a cryptography course for an assignment!)
While I also don’t know many people that use this for E-mail, it doesn’t help that virtually every OS update in the last 5 years has consistently broken it, taking sometimes months for a fix.
For those reasons, this needs to be baked into the OS to be viable. Only when somebody like Apple can install it by default, and make sure it works between updates, will it have the reliability and widespread availability that is necessary for success.
While I also don’t know many people that use this for E-mail, it doesn’t help that virtually every OS update in the last 5 years has consistently broken it, taking sometimes months for a fix.
For those reasons, this needs to be baked into the OS to be viable. Only when somebody like Apple can install it by default, and make sure it works between updates, will it have the reliability and widespread availability that is necessary for success.