[Altair] Adds Thunderbird email, protonmail bridge. [Nix] Fixes deprecated expressions

home-manager/features/email.nix

@@ -0,0 +1,23 @@
+_: {
+  # Proton Mail is fully encrypted on the servers so it doesn't support POP3 or
+  # IMAP.  In order to connect we need to set up a bridge that will download
+  # the mail and decrypt it locally.
+  services.protonmail-bridge.enable = true;
+
+  programs.thunderbird = {
+    enable = true;
+
+    profiles.drew = {
+      isDefault = true;
+      accountsOrder = [ "proton" ];
+    };
+  };
+
+  accounts.email.accounts.proton = {
+    enable = true;
+    primary = true;
+    address = "drew@blazestar.net";
+    realName = "Drew Haven";
+    thunderbird.enable = true;
+  };
+}