Suppress ETIMEDOUT errors

imap-core/lib/imap-server.js

@@ -176,7 +176,7 @@ class IMAPServer extends EventEmitter {
      * @event
      */
     _onError(err) {
-        errors.notify(err);
+        errors.notifyConnection(false, err);
         this.emit('error', err);
     }
 
@@ -194,7 +194,21 @@ class IMAPServer extends EventEmitter {
                 return;
             }
             returned = true;
-            callback(err || new Error('Socket closed unexpectedly'));
+            if (err && /SSL23_GET_CLIENT_HELLO/.test(err.message)) {
+                let message = err.message;
+                err.message = 'Failed to establish TLS session';
+                err.meta = {
+                    message,
+                    remoteAddress: socket.remoteAddress
+                };
+            }
+            if (!err) {
+                err = new Error('Socket closed unexpectedly');
+                err.meta = {
+                    remoteAddress: socket.remoteAddress
+                };
+            }
+            callback(err);
         };
 
         // remove all listeners from the original socket besides the error handler

lib/errors.js

@@ -18,6 +18,7 @@ module.exports.notify = (...args) => {
 };
 
 module.exports.notifyConnection = (connection, ...args) => {
+    let err = args[0];
     let metaData = args[1] || {};
 
     if (connection) {
@@ -33,6 +34,10 @@ module.exports.notifyConnection = (connection, ...args) => {
         metaData.isUTF8Enabled = !!connection.acceptUTF8Enabled;
     }
 
+    Object.keys(err.meta || {}).forEach(key => {
+        metaData[key] = err.meta[key];
+    });
+
     args[1] = metaData;
 
     if (bugsnag) {