If the client is connecting to Exchange via MAPI (the normal Outlook configuration), you won't see that information in the headers. The only way to make it happen would be to configure clients for POP/SMTP access with Exchange. Carl -----Original Message----- From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Honório Côrte-real Sent: Friday, March 24, 2006 7:05 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Message header Hi all, When a user send mail to a recipient outside our organization through exchange smtp virtual server, the message header does not include the Client Hostname and Client IP address. How to configure Exchange SMTP Virtual Server to include the sender's IP address and hostname in all message headers. It's something like this: Received: from unknown (HELO D0261) (email@xxxxxxxxxx@[192.168.1.145]) (envelope-sender <email@xxxxxxxxxx>) by mail.sl.pt (qmail-ldap-1.03) with SMTP for <desination@xxxxxxxxx>; 22 Mar 2006 18:24:56 -0000 Where "D0261" and "[192.168.1.145]" is hostname and the senders ip address respectively. Any help would be appreciated. Regards, Honório Côrte-real PT.COM / DER www.sapo.pt