Hi Folks, Hope someone can help with this little problem: I am using SBS 2000 which has Exchange 2000 intergrated together with Isa etc,etc, E-mail is sent via SMTP and incoming is picked up via individual POP3 mailboxes. When trying to send directly, or reply to mail from AOL or Compuserve I have received the following messages: My SBS server is using the default settings throughout, all other destinations work fine. Names have been changed for security reasons. messages as received: Your message did not reach some or all of the intended recipients. Subject: Inverter Info Sent: 12/03/2003 16:53 The following recipient(s) could not be reached: anyperson@xxxxxxxxxxxxxx on 12/03/2003 16:54 You do not have permission to send to this recipient. For assistance, contact your system administrator. <anyserver01.anycompanyLtd.local #5.7.1 smtp;550 5.7.1 IP address denied-3> NEXT Message: Your message did not reach some or all of the intended recipients. Subject: RE: Hotels - Sent: 06/03/2003 17:26 The following recipient(s) could not be reached: anyperson@xxxxxxx' on 08/03/2003 17:40 Could not deliver the message in the time limit specified. Please retry or contact your administrator. <anyserver01.server.local #4.4.7> anyperson@xxxxxxx' on 08/03/2003 17:40 Could not deliver the message in the time limit specified. Please retry or contact your administrator. <anyserver01.server.local #4.4.7> Any help much appreciated. Regards, Rick Parsons