diff --git a/ARC-message-fail-tests.patch b/ARC-message-fail-tests.patch
new file mode 100644
index 0000000..b705a62
--- /dev/null
+++ b/ARC-message-fail-tests.patch
@@ -0,0 +1,46 @@
+---
+ src/mailman/handlers/tests/test_arc_validate.py |   12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+--- a/src/mailman/handlers/tests/test_arc_validate.py
++++ b/src/mailman/handlers/tests/test_arc_validate.py
+@@ -192,7 +192,7 @@ This is a test message.
+         ValidateAuthenticity().process(lst, msg, msgdata)
+         res = ["lists.example.org; spf=pass smtp.mfrom=jqd@d1.example"
+                "; dkim=pass header.i=@d1.example; dmarc=pass; arc=fail"]
+-        self.assertEqual(msg["Authentication-Results"], ''.join(res))
++        self.assertIn(''.join(res), msg["Authentication-Results"])
+ 
+     def test_authentication_whitelist_hit(self):
+         config.push('just_dkim', """
+@@ -235,7 +235,7 @@ This is a test!
+ 
+         res = ["example.com; spf=pass smtp.mailfrom=gmail.com"
+                "; dkim=pass header.d=valimail.com; arc=none"]
+-        self.assertEqual(msg["Authentication-Results"], ''.join(res))
++        self.assertIn(''.join(res), msg["Authentication-Results"])
+ 
+     def test_authentication_whitelist_miss(self):
+         config.push('just_dkim', """
+@@ -276,8 +276,8 @@ This is a test!
+ """)
+ 
+         ValidateAuthenticity().process(lst, msg, msgdata)
+-        self.assertEqual(msg["Authentication-Results"],
+-                         "test.com; dkim=pass header.d=valimail.com; arc=none")
++        self.assertIn("test.com; dkim=pass header.d=valimail.com; arc=none",
++                      msg["Authentication-Results"])
+ 
+     def test_authentication_bad_outlook_header(self):
+         config.push('just_dkim', """
+@@ -320,8 +320,8 @@ This is a test!
+ """)
+ 
+         ValidateAuthenticity().process(lst, msg, msgdata)
+-        self.assertEqual(msg["Authentication-Results"],
+-                         "test.com; dkim=fail header.d=valimail.com; arc=none")
++        self.assertIn("test.com; dkim=fail header.d=valimail.com; arc=none",
++                      msg["Authentication-Results"])
+ 
+ 
+ class TestTimeout(unittest.TestCase):
diff --git a/python-mailman.changes b/python-mailman.changes
index 661f774..4464301 100644
--- a/python-mailman.changes
+++ b/python-mailman.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Jan 19 20:26:32 UTC 2022 - Matej Cepl <mcepl@suse.com>
+
+- Add patch ARC-message-fail-tests.patch which allows four tests
+  to pass with different format of the output.
+
 -------------------------------------------------------------------
 Tue Jan 18 08:28:16 UTC 2022 - pgajdos@suse.com
 
diff --git a/python-mailman.spec b/python-mailman.spec
index 3ab7e7f..6c61d82 100644
--- a/python-mailman.spec
+++ b/python-mailman.spec
@@ -67,6 +67,9 @@ Patch1:         support-sqlalchemy-1-4.patch
 # Suppprt Alembic 1.7.x
 Patch2:         support-alembic-1-7.patch
 #
+# PATCH-FIX-UPSTREAM ARC-message-fail-tests.patch bsc#[0-9]+ mcepl@suse.com
+# this patch makes things totally awesome
+Patch3:         ARC-message-fail-tests.patch
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  fdupes
 BuildRequires:  python-rpm-macros