Hi, I have customer, who wish not only deny messages for specifics internal (ADU&C on the Exchange server and go into the properties of user or DG. and Delivery Restrictions); he want also deny sending message to these specifics internal users, from others specifics internal user. For this last point, I don't have, idéa ! can someone help me ? Exchange 2003 SP2 Users already belong to "restrict users external mail group", based on this article : http://support.microsoft.com/kb/924635/en-us ************ In clear, 1- Deny Bill to send to Balmer 2- Dont allow Bill to receive from Balmer Both exist in same ORGANIZATION These articles don't match the purpose : http://support.microsoft.com/kb/827616/en-us Best regard Gilles