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-rw-r--r--nixos/modules/services/mail/nullmailer.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixos/modules/services/mail/nullmailer.nix b/nixos/modules/services/mail/nullmailer.nix
index fe3f8ef9b39..09874ca0ed7 100644
--- a/nixos/modules/services/mail/nullmailer.nix
+++ b/nixos/modules/services/mail/nullmailer.nix
@@ -204,6 +204,7 @@ with lib;
       users.${cfg.user} = {
         description = "Nullmailer relay-only mta user";
         group = cfg.group;
+        isSystemUser = true;
       };
 
       groups.${cfg.group} = { };