Remove non longer supported configurations (<21.05)

default.nix

@@ -421,8 +421,7 @@ in
         The mailboxes for dovecot.
         Depending on the mail client used it might be necessary to change some mailbox's name.
       '';
-      default = let
-        defMailBoxes = {
+      default = {
         Trash = {
           auto = "no";
           specialUse = "Trash";
@@ -440,8 +439,6 @@ in
           specialUse = "Sent";
         };
       };
-      in if (versionAtLeast version "20.09pre") then defMailBoxes
-      else (flip mapAttrsToList defMailBoxes (name: options: { inherit name; } // options));
     };
 
     certificateScheme = mkOption {

mail-server/clamav.nix

@@ -18,25 +18,13 @@
 
 let
   cfg = config.mailserver;
-  clamHasSettings = options.services.clamav.daemon ? settings;
 in
-with lib;
 {
   config = lib.mkIf (cfg.enable && cfg.virusScanning) {
-
-    # Remove extraConfig and settings conditional after 20.09 support is removed
-
     services.clamav.daemon = {
       enable = true;
-    } // (if clamHasSettings then {
       settings.PhishingScanURLs = "no";
-    } else {
-      extraConfig = ''
-        PhishingScanURLs no
-      '';
-    });
-
+    };
     services.clamav.updater.enable = true;
   };
 }
-