--- /dev/null
+\ 1\ 1\ 1\ 1
+Received: from CALLER by the.local.host.name with local (Exim x.yz)
+ (envelope-from <CALLER@test.ex>)
+ id 10HmbB-0005vi-00
+ for mmdf_userz@test.ex; Tue, 2 Mar 1999 09:44:33 +0000
+Message-Id: <E10HmbB-0005vi-00@the.local.host.name>
+From: CALLER_NAME <CALLER@test.ex>
+Date: Tue, 2 Mar 1999 09:44:33 +0000
+
+Test message with mmdf_ prefix
+\ 1\ 1\ 1\ 1
+\ 1\ 1\ 1\ 1
+Received: from CALLER by the.local.host.name with local (Exim x.yz)
+ (envelope-from <CALLER@test.ex>)
+ id 10HmbC-0005vi-00
+ for userz@test.ex; Tue, 2 Mar 1999 09:44:33 +0000
+Message-Id: <E10HmbC-0005vi-00@the.local.host.name>
+From: CALLER_NAME <CALLER@test.ex>
+Date: Tue, 2 Mar 1999 09:44:33 +0000
+
+Second test message, no prefix.
+\ 1\ 1\ 1\ 1
+\ 1\ 1\ 1\ 1
+Received: from CALLER by the.local.host.name with local (Exim x.yz)
+ (envelope-from <CALLER@test.ex>)
+ id 10HmbD-0005vi-00
+ for userz@test.ex; Tue, 2 Mar 1999 09:44:33 +0000
+Message-Id: <E10HmbD-0005vi-00@the.local.host.name>
+From: CALLER_NAME <CALLER@test.ex>
+Date: Tue, 2 Mar 1999 09:44:33 +0000
+
+Second test message, no prefix.
+\ 1\ 1\ 1\ 1