diff --git a/src/matrix-server-config.html b/src/matrix-server-config.html
index fd7bba7..60db2f7 100644
--- a/src/matrix-server-config.html
+++ b/src/matrix-server-config.html
@@ -36,7 +36,8 @@
             name: { value: null },
             autoAcceptRoomInvites: { value: true },
             enableE2ee: { type: "checkbox", value: true },
-            global: { type: "checkbox", value: true }
+            global: { type: "checkbox", value: true },
+            allowUnknownDevices: { type: "checkbox", value: false }
         },
         icon: "matrix.png",
         label: function() {
@@ -130,6 +131,20 @@
             <code style="white-space: normal;">let client = global.get("matrixClient['@bot:example.com']");</code>
         </div>
     </div>
+
+    <div class="form-row">
+        <input
+                type="checkbox"
+                id="node-config-input-allowUnknownDevices"
+                style="width: auto; margin-left: 125px; vertical-align: top"
+        />
+        <label for="node-config-input-allowUnknownDevices" style="width: auto">
+            Allow unverified devices in rooms
+        </label>
+        <div class="form-tips" style="margin-bottom: 12px;">
+            Allow sending messages to a room with unknown devices which have not been verified.
+        </div>
+    </div>
     <script type="text/javascript">
         $("#matrix-login-btn").on("click", function() {
             function prettyPrintJson(json) {
diff --git a/src/matrix-server-config.js b/src/matrix-server-config.js
index f7de643..c34222b 100644
--- a/src/matrix-server-config.js
+++ b/src/matrix-server-config.js
@@ -56,6 +56,7 @@ module.exports = function(RED) {
         this.autoAcceptRoomInvites = n.autoAcceptRoomInvites;
         this.e2ee = n.enableE2ee || false;
         this.globalAccess = n.global;
+        this.allowUnknownDevices = n.allowUnknownDevices || false;
         this.initializedAt = new Date();
         node.initialSyncLimit = 25;
 
@@ -401,6 +402,7 @@ module.exports = function(RED) {
                         node.log("Initializing crypto...");
                         await node.matrixClient.initCrypto();
                         node.matrixClient.getCrypto().globalBlacklistUnverifiedDevices = false; // prevent errors from unverified devices
+                        node.matrixClient.getCrypto().globalErrorOnUnknownDevices  = !node.allowUnknownDevices;
                     }
                     node.log("Connecting to Matrix server...");
                     await node.matrixClient.startClient({