diff --git a/app/main.py b/app/main.py
index 9240299..ef67890 100644
--- a/app/main.py
+++ b/app/main.py
@@ -902,14 +902,25 @@ async def matrix_member_mxids(client: httpx.AsyncClient):
     """
     extra = [m.strip() for m in os.environ.get("MATRIX_EXTRA_MXIDS", "").split(",") if m.strip()]
     seen: set[str] = set()
-    r = await client.get(
-        f"{CLOUDRON_API}/api/v1/users",
-        headers=cloudron_headers(),
-    )
-    users = (
-        {u["email"].lower(): u["username"] for u in r.json().get("users", [])}
-        if r.status_code == 200 else {}
-    )
+    # Cloudron paginates /api/v1/users at 25/page — walk every page.
+    users: dict[str, str] = {}
+    page = 1
+    while True:
+        r = await client.get(
+            f"{CLOUDRON_API}/api/v1/users",
+            params={"page": page},
+            headers=cloudron_headers(),
+        )
+        if r.status_code != 200:
+            logger.warning("Cloudron users lookup page %s failed: %s", page, r.status_code)
+            break
+        batch = r.json().get("users", [])
+        for u in batch:
+            if u.get("email") and u.get("username"):
+                users[u["email"].lower()] = u["username"]
+        if len(batch) < 25:
+            break
+        page += 1
     for email in await get_active_member_emails():
         username = users.get(email.lower())
         if username: