nixos/postfix: fix masterCf type

Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>

1 files changed, 1 insertions, 1 deletions

diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 319b3b638444f..795a76f748a75 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -52,7 +52,7 @@ let
       };
 
       type = mkOption {
-        type = types.enum [ "inet" "unix" "fifo" "pass" ];
+        type = types.enum [ "inet" "unix" "unix-dgram" "fifo" "pass" ];
         default = "unix";
         example = "inet";
         description = "The type of the service";