Over the past several months, a very strange thing has been happening in our mail server (Exchange 2000). We are receiving mails as undelivered that we never send and also a same copy of the message is being sent to many people and in many times. We are using Norton Antivirus for Exchange as an antivirus solution and its realtime protection engine is able to detect alot of viruses (Netsky....) mainly. Still there are a lot of complains from the users that they are receiving messages as undelivered which they never sent before. Any help would be highly appreciated. Thank you, Badri Khanal Systems Administrator United Mission to Nepal Kathmandu, Nepal Message Disclaimer: This electronic message may contain confidential information. If you have received it in error, please immediately inform the sender and delete the mail and any attachments. Unless it relates to the official business of UMN, any opinions, views and other information expressed in this document are those of the individual sender.