From 649672e76e507440259a158d564b7a6185179ef9 Mon Sep 17 00:00:00 2001
From: Luke Granger-Brown <git@lukegb.com>
Date: Sun, 2 May 2021 21:49:33 +0000
Subject: [PATCH] nixos/postfix: fix compatibility level

Postfix has started outputting an error on startup that it can't parse
the compatibility level 9999.

Instead, just set the compatibility level to be identical to the current
version, which seems to be the (new) intent for the compatibility level.
---
 nixos/modules/services/mail/postfix.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 8e5bed5fcb87..35639e1bbc83 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -773,7 +773,7 @@ in
         };
 
       services.postfix.config = (mapAttrs (_: v: mkDefault v) {
-        compatibility_level  = "9999";
+        compatibility_level  = pkgs.postfix.version;
         mail_owner           = cfg.user;
         default_privs        = "nobody";