diff --git a/lib/imap-flow.js b/lib/imap-flow.js
index 3fd5cd3..e4118c9 100644
--- a/lib/imap-flow.js
+++ b/lib/imap-flow.js
@@ -387,9 +387,18 @@ class ImapFlow extends EventEmitter {
     }
 
     write(chunk) {
-        if (this.socket.destroyed || this.state === this.states.LOGOUT) {
+        if (this.socket.destroyed) {
             // do not write after connection end or logout
-            return;
+            const error = new Error('Socket is already closed');
+            error.code = 'NoConnection';
+            throw error;
+        }
+
+        if (this.state === this.states.LOGOUT) {
+            // should not happen
+            const error = new Error('Can not send data after logged out');
+            error.code = 'StateLogout';
+            throw error;
         }
 
         if (this.writeSocket.destroyed) {
@@ -471,6 +480,7 @@ class ImapFlow extends EventEmitter {
         let options = data.options || {};
 
         this.log.debug({ src: 's', msg: logCompiled.toString(), cid: this.id, comment: options.comment });
+
         this.write(this.commandParts.shift());
 
         if (typeof options.onSend === 'function') {