Hi all, One of our user received a message from NAVMSE-KLANPROXY@xxxxxxxxxxx saying that he sent a mail to Banu Akin containing virus. But he says that he didn't send any email to Banu Akin, he even doesn't know her. We scanned his computer but no virus is found. Do you have any idea that how this email was sent to this person? What can I do to prevent this kind problems both on server side and client side? Thanks, Regards, The message returned from NAVMSE-KLANPROXY@xxxxxxxxxxx is as below. -----Original Message----- From: NAV for Microsoft Exchange-KLANPROXY [mailto:NAVMSE-KLANPROXY@xxxxxxxxxxx] Sent: Wednesday, May 08, 2002 4:00 PM To: 'nustun' Subject: Norton AntiVirus detected and quarantined a virus in a message you sent. Recipient of the infected attachment: Banu AKIN\Inbox Subject of the message: EngOpts, true) One or more attachments were quarantined. Attachment 4061836.exe was Quarantined for the following reasons: Virus W32.Klez.gen@mm was found.