diff --git a/nixos/modules/services/mail/stalwart-mail.nix b/nixos/modules/services/mail/stalwart-mail.nix
index 29f1a01522b4..776243a68af5 100644
--- a/nixos/modules/services/mail/stalwart-mail.nix
+++ b/nixos/modules/services/mail/stalwart-mail.nix
@@ -60,6 +60,9 @@ in {
       resolver.public-suffix = lib.mkDefault [
         "file://${pkgs.publicsuffix-list}/share/publicsuffix/public_suffix_list.dat"
       ];
+      config.resource = {
+        spam-filter = lib.mkDefault "file://${cfg.package}/etc/stalwart/spamfilter.toml";
+      };
     };
 
     # This service stores a potentially large amount of data.
diff --git a/pkgs/by-name/st/stalwart-mail/package.nix b/pkgs/by-name/st/stalwart-mail/package.nix
index a2594799be07..14df24b62ef8 100644
--- a/pkgs/by-name/st/stalwart-mail/package.nix
+++ b/pkgs/by-name/st/stalwart-mail/package.nix
@@ -74,6 +74,10 @@ rustPlatform.buildRustPackage {
   };
 
   postInstall = ''
+    mkdir -p $out/etc/stalwart
+    cp resources/config/spamfilter.toml $out/etc/stalwart/spamfilter.toml
+    cp -r resources/config/spamfilter $out/etc/stalwart/
+
     mkdir -p $out/lib/systemd/system
 
     substitute resources/systemd/stalwart-mail.service $out/lib/systemd/system/stalwart-mail.service \