diff --git a/config/scripts/smtpdummy b/config/scripts/smtpdummy
index adb224d..4beab74 100755
--- a/config/scripts/smtpdummy
+++ b/config/scripts/smtpdummy
@@ -9,6 +9,7 @@ import io
 import pprint
 import subprocess
 import sys
+import uuid
 
 
 if __name__ == "__main__":
@@ -72,6 +73,7 @@ if __name__ == "__main__":
     if args.password:
         password = args.password
         args.password = "********"
+    mid = f"{uuid.uuid1()}@{args.helo}"
 
     # Transmission content
 
@@ -89,6 +91,7 @@ XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X"""
 From: {getattr(args, 'from')}
 Subject: {args.subject}
 To: {args.to}
+Message-ID: {mid}
 
 Hello there,