Generate mail accounts from a user list.

services/mailserver.nix

@@ -3,18 +3,19 @@
 with lib;
 
 mkIf (elem "mailserver" config.machine.services) {
-  mailserver = rec {
+  mailserver = let
+    mkUser = username: {
+      name = "${username}@${config.machine.domain}";
+      value = {
+        hashedPassword = (fileContents "/secret/${username}.mail");
+      };
+    };
+  in rec {
     enable = true;
     fqdn = "mail.${config.machine.domain}";
     domains = [ config.machine.domain ];
-    loginAccounts = {
-      "derped@${config.machine.domain}" = {
-        hashedPassword = (fileContents /secret/derped.mail);
-      };
-      "mailman3@${config.machine.domain}" = {
-        hashedPassword = (fileContents /secret/mailman3.mail);
-      };
-    };
+    loginAccounts = listToAttrs (map mkUser config.machine.mailAccounts);
+
     # Use Let's Encrypt certificates. Note that this needs to set up a stripped
     # down nginx and opens port 80.
     certificateScheme = 1;