iNotes mail encryption

iNotes mail encryption buttons (sign) and (Encrypt) … some users have the ability to check them … others the buttons are grayed out. Not pc issue as I’ve opened two accounts on my pc – one is okay, the other grayed out. Can’t find anything under preferences. Suggestions? Thanks

Subject: just a hunch

wonder if the difference could be some users have merged their id into their mailfile and others not?