Thunderbird

OpenPGP #

Encrypt using key without user ID matching the recipient email address #

Thunderbird normally requires that a recipient’s public key contains a user ID with a matching email address. This can be overridden by using OpenPGP recipient alias rules. (1, 2)

In the profile directory (Help -> Troubleshooting Information -> Profile Directory), create a file called openpgp_alias_to_keys.json. In about:config (Edit -> Settings -> *General -> Config Editor (at the very bottom)), create a preference mail.openpgp.alias_rules_file and set it to openpgp_alias_to_keys.json. Fill the file like this (descriptions are optional):

{
  "rules": [
    {
      "domain": "domain1.example.com",
      "keys": [
        {
          "description": "Catch-all for domain1.example.com",
          "fingerprint": "EB85BB5FA33A75E15E944E63F231550C4F47E38E"
        }
      ]
    },
    {
      "email": "list@domain1.example.com",
      "keys": [
        {
          "description": "John",
          "fingerprint": "D1A66E1A23B182C9980F788CFBFCC82A015E7330"
        },
        {
          "description": "Eve",
          "id": "F231550C4F47E38E"
        }
      ]
    }
  ]
}

Restarting Thunderbird is not necessary but you do need to reopen the message window.