Facebook Permissions Disallow Sending This Message - Error Code #230

If you receive an Error #230 message stating: "Permissions disallow message to the user," when trying to send a message to another Facebook user, this is not an indication that anything is wrong in your account. It means that the user you are trying to message has disabled the Apps Platform on their account. 

Since that user chose to disable the Apps Platform in their own Facebook settings, you will not be able to send them a message.

For more information, please see the detailed article Facebook has written on the disabling of the Apps Platform