Mailenable Expert URGENT

Installation and Setup of Mailenable email server has been completed, but recipients are complaining that when they try to email us, they get this error response: Remote host said: 503 This mail server requ Remote host said: 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server. Giving up ... Currently licensed version 2.53. Please do not respond if you have never worked with Mailenable. ## Deliverables Mailenable is installed on Windows 2003 Server.