diff --git a/pkgs/development/libraries/libasr/default.nix b/pkgs/development/libraries/libasr/default.nix
new file mode 100644
index 000000000000..f4c9cc8c5e01
--- /dev/null
+++ b/pkgs/development/libraries/libasr/default.nix
@@ -0,0 +1,20 @@
+{ stdenv, fetchurl, libevent, openssl }:
+
+stdenv.mkDerivation rec {
+  name = "libasr-${version}";
+  version=  "1.0.1";
+
+  src = fetchurl {
+    url = "https://www.opensmtpd.org/archives/${name}.tar.gz";
+    sha256 = "10h1c9b58msbggns8k2m0857zmbldb0x8ghk3aay88yn2bip2916";
+  };
+
+  buildInputs = [ libevent openssl ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/OpenSMTPD/libasr;
+    description = "Free, simple and portable asynchronous resolver library.";
+    license = licenses.isc;
+    maintainers = [ maintainers.koral ];
+  };
+}
diff --git a/pkgs/servers/mail/opensmtpd/default.nix b/pkgs/servers/mail/opensmtpd/default.nix
index 8cabb8cac942..d2c19a2a00b1 100644
--- a/pkgs/servers/mail/opensmtpd/default.nix
+++ b/pkgs/servers/mail/opensmtpd/default.nix
@@ -1,17 +1,17 @@
-{ stdenv, fetchurl, libevent, zlib, openssl, db, bison, pam }:
+{ stdenv, fetchurl, libasr, libevent, zlib, openssl, db, bison, pam }:
 
 stdenv.mkDerivation rec {
   name = "opensmtpd-${version}";
-  version = "5.4.2p1";
+  version = "5.4.4p1";
 
-  buildInputs = [ libevent zlib openssl db bison pam ];
+  buildInputs = [ libasr libevent zlib openssl db bison pam ];
 
   src = fetchurl {
     url = "http://www.opensmtpd.org/archives/${name}.tar.gz";
-    sha256 = "18nrzfjhv9znb5dbhc5k3fi31a3vr1r8j36q3fzghkh47n6z9yjg";
-  };  
+    sha256 = "1gcfdmpkk892wnnhwc2nb559bwl3k892w7saj4q8m6jfll53660i";
+  };
 
-  configureFlags = [ 
+  configureFlags = [
     "--with-mantype=doc"
     "--with-pam"
     "--without-bsd-auth"
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
     "--with-privsep-user=smtpd"
     "--with-queue-user=smtpq"
     "--with-ca-file=/etc/ssl/certs/ca-bundle.crt"
-  ];  
+  ];
 
   meta = {
     homepage = https://www.opensmtpd.org/;
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index ca3bfbeb5f99..a40f943f99d7 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5966,6 +5966,8 @@ let
 
   libarchive = callPackage ../development/libraries/libarchive { };
 
+  libasr = callPackage ../development/libraries/libasr { };
+
   libass = callPackage ../development/libraries/libass { };
 
   libassuan1 = callPackage ../development/libraries/libassuan1 { };