diff --git a/flake.nix b/flake.nix
index 2f21a87..2df1bf6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -56,6 +56,7 @@
         overlays/zfs-relmount
         overlays/ical2org.nix
         overlays/mautrix-discord.nix
+        overlays/maildrop
       ];
 
       flake.nixosModules = {
diff --git a/overlays/maildrop/default.nix b/overlays/maildrop/default.nix
new file mode 100644
index 0000000..94baa5f
--- /dev/null
+++ b/overlays/maildrop/default.nix
@@ -0,0 +1,49 @@
+{ lib, ... }:
+let
+  inherit (lib)
+    singleton;
+
+  pname = "maildrop";
+  version = "3.1.5";
+in
+{
+  flake.overlays.maildrop =
+    final: prev:
+    {
+      maildrop = prev.stdenv.mkDerivation {
+        inherit pname version;
+
+        src = prev.fetchurl {
+          url = "mirror://sourceforge/courier/${pname}/${version}/${pname}-${version}.tar.bz2";
+          sha256 = "sha256-Izg/s5uSaQRWRpOXSO5zfnXJ8jmU+MBnI/MEyXp42lo=";
+        };
+
+        nativeBuildInputs = with prev; singleton pkg-config;
+        buildInputs = with prev; [
+          perl
+          pcre2.dev
+          libidn2.dev
+          courier-unicode
+        ];
+
+        patches = [
+          ./dont-reset-path.patch
+          ./maildrop.configure.hack.patch
+        ];
+
+        doCheck = false;
+
+        configureFlags = [
+          "--enable-maildrop-uid="
+          "--enable-maildrop-gid="
+        ];
+
+        meta = with lib; {
+          homepage = "http://www.courier-mta.org/maildrop/";
+          description = "Mail filter/mail delivery agent that is used by the Courier Mail Server";
+          license = licenses.gpl3;
+          platforms = platforms.linux;
+        };
+      };
+    };
+}
diff --git a/overlays/maildrop/dont-reset-path.patch b/overlays/maildrop/dont-reset-path.patch
new file mode 100644
index 0000000..b07f378
--- /dev/null
+++ b/overlays/maildrop/dont-reset-path.patch
@@ -0,0 +1,29 @@
+From 205aad195842ce19350261849d6378b39e00b11c Mon Sep 17 00:00:00 2001
+From: main <magic_rb@redalder.org>
+Date: Sun, 10 Apr 2022 15:35:10 +0200
+Subject: [PATCH] dont reset path
+
+---
+ libs/maildrop/main.C | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/libs/maildrop/main.C b/libs/maildrop/main.C
+index efc7d1f..daf9d2d 100644
+--- a/libs/maildrop/main.C
++++ b/libs/maildrop/main.C
+@@ -66,8 +66,8 @@ int quota_warn_percent = -1;
+ const char *quota_warn_message=0;
+
+ static const char *defaults_vars[]={"LOCKEXT","LOCKSLEEP","LOCKTIMEOUT",
+-					"LOCKREFRESH", "PATH", "SENDMAIL",
++					"LOCKREFRESH", "SENDMAIL",
+ 					"MAILDIRQUOTA"};
+ static const char *defaults_vals[]={LOCKEXT_DEF,LOCKSLEEP_DEF,LOCKTIMEOUT_DEF,
+-					LOCKREFRESH_DEF, DEFAULT_PATH,
++					LOCKREFRESH_DEF,
+ 					SENDMAIL_DEF, ""};
+
+ Maildrop maildrop;
+--
+2.35.1
+
diff --git a/overlays/maildrop/maildrop.configure.hack.patch b/overlays/maildrop/maildrop.configure.hack.patch
new file mode 100644
index 0000000..130432a
--- /dev/null
+++ b/overlays/maildrop/maildrop.configure.hack.patch
@@ -0,0 +1,13 @@
+--- a/libs/maildrop/configure	2012-09-06 01:52:13.000000000 +0100
++++ b/libs/maildrop/configure	2013-01-04 03:00:57.095628327 +0000
+@@ -17562,8 +17562,8 @@
+ check_spooldir() {
+   if test "$CHECKED_SPOOLDIR" != 1
+   then
+-     get_spooldir
+-     MBOX_DIR="$SPOOLDIR"
++     MBOX_DIR="/var/spool/mail"
++     MBOX_RESET_GID=0
+      CHECKED_SPOOLDIR=1
+   fi
+ }
\ No newline at end of file