diff --git a/signal_webhook/app.py b/signal_webhook/app.py
index b600c9a..2a80037 100644
--- a/signal_webhook/app.py
+++ b/signal_webhook/app.py
@@ -13,7 +13,8 @@ def root() -> t.Tuple[str, int]:
 
 
 @app.route("/alertmanager", methods=["POST"])
-def alertmanager():
+@app.route("/alertmanager/<recipient>", methods=["POST"])
+def alertmanager(recipient=None):
     data = request.get_json(cache=False)
 
     if "version" not in data or int(data["version"]) != 4:
@@ -42,6 +43,13 @@ def alertmanager():
     msg += "\n\n"
     msg += "\n".join(["* " + line for line in alert_lines])
 
-    signal.signal_send(configuration.RECIPIENTS[configuration.DEFAULT_RECIPIENT], msg)
+    if recipient is None:
+        recipient = configuration.DEFAULT_RECIPIENT
+    try:
+        recipient_nums = configuration.RECIPIENTS[recipient]
+    except KeyError:
+        return "Bad recipient", 400
+
+    signal.signal_send(recipient_nums, msg)
 
     return "OK", 200
diff --git a/signal_webhook/configuration.sample.py b/signal_webhook/configuration.sample.py
index bc1920b..8869e32 100644
--- a/signal_webhook/configuration.sample.py
+++ b/signal_webhook/configuration.sample.py
@@ -1,5 +1,5 @@
 # Signal 'address book'
-RECIPIENTS = {"foo": "+42..."}  # FIXME
+RECIPIENTS = {"foo": ["+42..."]}  # FIXME
 
 # Recipient from the dict above to send to by default
 DEFAULT_RECIPIENT = "foo"  # FIXME
diff --git a/signal_webhook/signal.py b/signal_webhook/signal.py
index 636b5df..525122b 100644
--- a/signal_webhook/signal.py
+++ b/signal_webhook/signal.py
@@ -5,14 +5,14 @@ from gi.repository.GLib import GError
 logger = logging.getLogger(__name__)
 
 
-def signal_send(recipient, message):
+def signal_send(recipients, message):
     try:
         bus = SystemBus()
         signal_bus = bus.get("org.asamk.Signal")
         signal_bus.sendMessage(
             message,
             [],
-            [recipient],
+            recipients,
         )
     except GError as exn:
         logger.error("Cannot send Signal notification: %s", exn)