i've been asked to extend kuvert a little, so that it optionally completely rejects emails unless it can encrypt it for all recipients.

that's done now; version 2.1.0 includes that new option, and a variety of minor fixes and code cleanup.

kuvert's source is downloadable here or on github. the updated manpage is available here.

...but wait, there's more.

recently i've been getting more feedback/patches via kuvert's github presence and kuvert has gained a few minor features and improvements: optional custom config file, you can configure your gpg path (welcome back, gpg1...) better starttls support (and debugging) if you're using a recentish perl and thus a modern net::smtp, better compat with weird clients if you use kuvert as msp and so on.

we're at version 2.2.1 now and as always kuvert is downloadable here or from github; naturally it's in debian unstable and will hit testing in a few days.