diff --git a/packetserver/http/routers/send.py b/packetserver/http/routers/send.py
index 0218861..71448f3 100644
--- a/packetserver/http/routers/send.py
+++ b/packetserver/http/routers/send.py
@@ -59,23 +59,19 @@ async def send_message(
         users_dict = root.get('users', {})
 
         # Prepare recipients
-        to_list = payload.to
-        to_tuple = tuple(to_list)
-        if "ALL" in to_list:
-            to_tuple = ("ALL",)
+        to_list = [c.upper() for c in payload.to]
+        is_to_all = "ALL" in to_list
 
-        is_bulletin = "ALL" in to_list
-
-        if is_bulletin:
-            # Bulletin: deliver to all registered users
+        if is_to_all:
+            # Deliver to all registered users
             valid_recipients = list(users_dict.keys())
             failed_recipients = []
         else:
-            # Private message: validate each recipient exists
+            # Private message validation
             valid_recipients = []
             failed_recipients = []
             for recip in to_list:
-                if users_dict.get(recip):
+                if recip in users_dict:
                     valid_recipients.append(recip)
                 else:
                     failed_recipients.append(recip)