a temporary workaround for this issue which seems to work for me consists of edit > preferences > mail accounts > "target account" > edit > security > and ticking "always trust keys in my keyring when encrypting"
i think this is an actual bug, i think it should ask if the particular key should be trusted each time if this is not ticked instead of passing "broken pipe" -- gpg broken pipe https://launchpad.net/bugs/40326 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
