Hello all, One of my client could not send an email to my company. I have no difficult to receive other client's email. Here is the bouncing back email to my client: The following recipient(s) could not be reached: xxxxxx@xxxxxx on 23/09/2004 9:50 AM You do not have permission to send to this recipient. For assistance, contact your system administrator. <xxxx.xxxxx.xxxxxxx.com #5.7.1 smtp;550 5.7.1 <xxxxx@xxxxxx>... Relaying denied. IP name possibly forged [xxx.xxx.xxx.xxx] Do you have any clue with this issue? Thank you Sam