MessageDear All Master, Today, our user got bounce email when they send email to outiside. Normally is no problem Please see error message : Your message did not reach some or all of the intended recipients. Sent: 10/14/2003 15:52 The following recipient(s) could not be reached: Ann Sasithorn on 10/14/2003 15:57 The recipient name is not recognized The MTS-ID of the original message is: c=US;a= ;p=kopap;l=KOPINDB1-031014085158Z-498 MSEXCH:IMS:kopap:Batam:KOPINDB1 3553 (000B099C) 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) Please advise what problem, then advise how to solve the problem Thank you Regards Jieff