+#
+#
+#
+#
+# This should fail because the signing pubkey is too small.
+exim -DSERVER=server -DMSIZE='rsa=1024 ed25519=300' -bd -oX PORT_D
+****
+#
+# Duplicate test input to the first one, above.
+#
+client 127.0.0.1 PORT_D
+??? 220
+HELO xxx
+??? 250
+MAIL FROM:<CALLER@bloggs.com>
+??? 250
+RCPT TO:<a@test.ex>
+??? 250
+DATA
+??? 354
+DKIM-Signature: v=1; a=ed25519-sha256; q=dns/txt; c=relaxed/relaxed; d=test.ex
+ ; s=sed; h=From:To:Subject; bh=/Ab0giHZitYQbDhFszoqQRUkgqueaX9zatJttIU/plc=;
+ b=5fhyD3EILDrnL4DnkD4hDaeis7+GSzL9GMHrhIDZJjuJ00WD5iI8SQ1q9rDfzFL/Kdw0VIyB4R
+ Dq0a4H6HI+Bw==;
+Received: from jgh by myhost.test.ex with local (Exim x.yz)
+ envelope-from <jgh@myhost.test.ex>)
+ 1dtXln-0000YP-Hb
+ a@test.ex; Sun, 17 Sep 2017 12:29:51 +0100
+From: nobody@example.com
+Message-Id: <E1dtXln-0000YP-Hb@myhost.test.ex>
+Sender: CALLER_NAME <jgh@myhost.test.ex>
+Date: Sun, 17 Sep 2017 12:29:51 +0100
+
+content
+.
+??? 250
+QUIT
+??? 221
+****
+killdaemon
+#