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-rw-r--r--nixos/modules/programs/ssmtp.nix7
1 files changed, 7 insertions, 0 deletions
diff --git a/nixos/modules/programs/ssmtp.nix b/nixos/modules/programs/ssmtp.nix
index 98ff21bd37f..1f49ddc91bb 100644
--- a/nixos/modules/programs/ssmtp.nix
+++ b/nixos/modules/programs/ssmtp.nix
@@ -142,6 +142,13 @@ in
 
   config = mkIf cfg.enable {
 
+    assertions = [
+      {
+        assertion = cfg.useSTARTTLS -> cfg.useTLS;
+        message = "services.ssmtp.useSTARTTLS has no effect without services.ssmtp.useTLS";
+      }
+    ];
+
     services.ssmtp.settings = mkMerge [
       ({
         MailHub = cfg.hostName;