diff --git a/nixos/tests/stalwart-mail.nix b/nixos/tests/stalwart-mail.nix
index cfc0d3bb1c5b..f5503c0cec19 100644
--- a/nixos/tests/stalwart-mail.nix
+++ b/nixos/tests/stalwart-mail.nix
@@ -48,9 +48,20 @@ in
           session.auth.directory = "'in-memory'";
           storage.directory = "in-memory";
 
+          storage.data = "rocksdb";
+          storage.fts = "rocksdb";
+          storage.blob = "rocksdb";
+          storage.lookup = "rocksdb";
+
           session.rcpt.directory = "'in-memory'";
           queue.outbound.next-hop = "'local'";
 
+          store."rocksdb" = {
+            type = "rocksdb";
+            path = "/var/lib/stalwart-mail/data";
+            compression = "lz4";
+          };
+
           directory."in-memory" = {
             type = "memory";
             principals = [
@@ -116,6 +127,12 @@ in
       main.wait_for_open_port(143)
 
       main.succeed("test-smtp-submission")
+
+      # restart stalwart to test rocksdb compaction of existing database
+      main.succeed("systemctl restart stalwart-mail.service")
+      main.wait_for_open_port(587)
+      main.wait_for_open_port(143)
+
       main.succeed("test-imap-read")
     '';
 
diff --git a/pkgs/by-name/st/stalwart-mail/package.nix b/pkgs/by-name/st/stalwart-mail/package.nix
index a6aea418ca01..1567814a12a4 100644
--- a/pkgs/by-name/st/stalwart-mail/package.nix
+++ b/pkgs/by-name/st/stalwart-mail/package.nix
@@ -9,6 +9,7 @@
   sqlite,
   foundationdb,
   zstd,
+  rust-jemalloc-sys-unprefixed,
   stdenv,
   nix-update-script,
   nixosTests,
@@ -18,6 +19,9 @@
   stalwartEnterprise ? false,
 }:
 
+let
+  rocksdbJemalloc = rocksdb.override { enableJemalloc = true; };
+in
 rustPlatform.buildRustPackage (finalAttrs: {
   pname = "stalwart-mail" + (lib.optionalString stalwartEnterprise "-enterprise");
   version = "0.11.8";
@@ -29,6 +33,17 @@ rustPlatform.buildRustPackage (finalAttrs: {
     hash = "sha256-VqGosbSQxNeOS+kGtvXAmz6vyz5mJlXvKZM57B1Xue4=";
   };
 
+  # rocksdb does not properly distinguish between pointers it has allocated itself
+  # and pointers which were passed in and might be registered with a different
+  # allocator, so we enable the unprefixed_malloc_on_supported_platforms to use
+  # jemalloc implicitly in the entire process.
+  postPatch = ''
+    for file in crates/main/Cargo.toml tests/Cargo.toml; do
+      substituteInPlace $file --replace-fail \
+        'jemallocator = "0.5.0"' 'jemallocator = { version = "0.5.0", features = ["unprefixed_malloc_on_supported_platforms"] }'
+    done
+  '';
+
   useFetchCargoVendor = true;
   cargoHash = "sha256-iheURWxO0cOvO+FV01l2Vmo0B+S2mXzue6mx3gapftQ=";
 
@@ -43,6 +58,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
     openssl
     sqlite
     zstd
+    rust-jemalloc-sys-unprefixed
+    rocksdbJemalloc
   ] ++ lib.optionals (stdenv.hostPlatform.isLinux && withFoundationdb) [ foundationdb ];
 
   # Issue: https://github.com/stalwartlabs/mail-server/issues/1104
@@ -63,8 +80,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
   env = {
     OPENSSL_NO_VENDOR = true;
     ZSTD_SYS_USE_PKG_CONFIG = true;
-    ROCKSDB_INCLUDE_DIR = "${rocksdb}/include";
-    ROCKSDB_LIB_DIR = "${rocksdb}/lib";
+    ROCKSDB_INCLUDE_DIR = "${rocksdbJemalloc}/include";
+    ROCKSDB_LIB_DIR = "${rocksdbJemalloc}/lib";
   };
 
   postInstall = ''
@@ -151,7 +168,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
   __darwinAllowLocalNetworking = true;
 
   passthru = {
-    inherit rocksdb; # make used rocksdb version available (e.g., for backup scripts)
+    rocksdb = rocksdbJemalloc; # make used rocksdb version available (e.g., for backup scripts)
     webadmin = callPackage ./webadmin.nix { };
     updateScript = nix-update-script { };
     tests.stalwart-mail = nixosTests.stalwart-mail;