I want TB to encrypt an email to my friend, firstname@domain.com. I have a certificate for him which is assigned to his name, firstname, but it doesn't have an email setting. While I ran enigma, I could choose the certificate to use when I sent an email and Enigma (IIRC) would ask if I'd like to make this assignment permanent (a "per-recipient" certificate assignment or something like that). I'd often say NO and then have to select the cert manually next time. Now that the ONE cert that shows up with "firstname" under the "Name" column is the correct one, that should be easy, but no such option shows up. TB first says "Unable to send this message with end-to-end encryption, because there are problems with the keys of the following recipients: illiquid@tutanota.com" ... OK (I click) and then it says "In order to send... you must obtain and accept..." and doesn't even present the list of certs (which I have already obtained and accepted) so that I can! It lists the recipients (only firstname@domain.com) and I can select one and click "Manage Keys for selected recipient." There are no keys to manage, and no clue as to how one ''which is already in my certificate list'' can be selected! Perhaps I am blind, or maybe when you guys built Enigma right into Thunderbird, you made some bad assumptions or forgot to include this feature. So How di I tell TB that firstname@domain.com should use the certificate that I already have?