diff --git a/config/scripts/smtpdummy b/config/scripts/smtpdummy
index 4beab74..5e452a8 100755
--- a/config/scripts/smtpdummy
+++ b/config/scripts/smtpdummy
@@ -38,7 +38,11 @@ if __name__ == "__main__":
         "-s", "--sender", env_var="SENDER", default="geoffrey@frogeye.fr"
     )
     parser.add_argument(
-        "-r", "--receiver", env_var="RECEIVER", default="geoffrey@frogeye.fr"
+        "-r",
+        "--receiver",
+        env_var="RECEIVER",
+        default=[],
+        action="append",
     )
     # parser.add_argument("-a", "--auth", env_var="AUTH", default="PLAIN")
     parser.add_argument("-u", "--user", env_var="MUSER")
@@ -64,12 +68,14 @@ if __name__ == "__main__":
     args = parser.parse_args()
 
     # Default values
+    if not args.receiver:
+        args.receiver = ["geoffrey@frogeye.fr"]
     if args.helo is None:
         args.helo = args.origin
     if getattr(args, "from") is None:
         setattr(args, "from", args.sender)
     if args.to is None:
-        args.to = args.receiver
+        args.to = args.receiver[0]
     if args.password:
         password = args.password
         args.password = "********"
@@ -186,7 +192,8 @@ Input arguments:
         ).decode()
         send(f"AUTH PLAIN {encoded}")
     send(f"MAIL FROM: <{args.sender}>")
-    send(f"RCPT TO: <{args.receiver}>")
+    for receiver in args.receiver:
+        send(f"RCPT TO: <{receiver}>")
     if not args.callout:
         send("DATA")
         send(text)