diff --git a/mail-filter/opensmtpd-filter-dkimsign/Manifest b/mail-filter/opensmtpd-filter-dkimsign/Manifest
new file mode 100644
index 0000000000..241c1abe3d
--- /dev/null
+++ b/mail-filter/opensmtpd-filter-dkimsign/Manifest
@@ -0,0 +1 @@
+DIST filter-dkimsign-0.6.tar.gz 24163 BLAKE2B f82175c6140a1691f5647562619420c57923cc2deadeabc4ac4b78eeaaa9ddaf6b73635034239e148a8532f77b0422ac52d1961a4f3549b6b686698592b71ae0 SHA512 1efab386a020c6a3cbf6059ce0feea539fa62be0990fd8538c4b152fa0c302d7bfffa7c7bb74643c25e47c20250f600f1371d2725dc3178ad103ce585530c0ce
diff --git a/mail-filter/opensmtpd-filter-dkimsign/metadata.xml b/mail-filter/opensmtpd-filter-dkimsign/metadata.xml
new file mode 100644
index 0000000000..e2fe48b180
--- /dev/null
+++ b/mail-filter/opensmtpd-filter-dkimsign/metadata.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>cyber+gentoo@sysrq.in</email>
+		<name>Anna</name>
+	</maintainer>
+	<upstream>
+		<maintainer>
+			<email>martijn@openbsd.org</email>
+			<name>Martijn van Duren</name>
+		</maintainer>
+	<use>
+		<flag name="ed25519">Enable ED25519 support</flag>
+	</use>
+</pkgmetadata>
diff --git a/mail-filter/opensmtpd-filter-dkimsign/opensmtpd-filter-dkimsign-0.6.ebuild b/mail-filter/opensmtpd-filter-dkimsign/opensmtpd-filter-dkimsign-0.6.ebuild
new file mode 100644
index 0000000000..f86e8f27d9
--- /dev/null
+++ b/mail-filter/opensmtpd-filter-dkimsign/opensmtpd-filter-dkimsign-0.6.ebuild
@@ -0,0 +1,46 @@
+# Copyright 2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit toolchain-funcs
+
+MY_P="${P#opensmtpd-}"
+DESCRIPTION="OpenSMTPD filter for DKIM signing"
+HOMEPAGE="http://imperialat.at/dev/filter-dkimsign/"
+SRC_URI="http://imperialat.at/releases/${MY_P}.tar.gz"
+S="${WORKDIR}/${MY_P}"
+
+LICENSE="ISC"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="+ed25519"
+
+DEPEND="
+	dev-libs/libopensmtpd:=
+	dev-libs/openssl:=
+"
+RDEPEND="${DEPEND}"
+BDEPEND="virtual/pkgconfig"
+
+src_configure() {
+	tc-export CC
+}
+
+src_compile() {
+	local myargs=(
+		MANFORMAT=mdoc
+		LIBCRYPTOPC=libcrypto
+		$(usex ed25519 HAVE_ED25519=1 '')
+	)
+	emake -f Makefile.gnu "${myargs[@]}"
+}
+
+src_install() {
+	local myargs=(
+		MANFORMAT=mdoc
+		DESTDIR="${D}"
+		LOCALBASE="${EPREFIX}"/usr
+	)
+	emake -f Makefile.gnu "${myargs[@]}" install
+}