Hi, i have Ex07 Server, recently ISP send to mail to me said our server always send out junk mail. but our server have so many user, i think i have some user infected virus, how can i check send out junk mail form which mail address? thank!

Refer below article on preventing to generate spam from your own domain... HOW TO: Prevent annoying spam from your own domain http://exchangepedia.com/blog/2008/09/how-to-prevent-annoying-spam-from-your.html Second, ask your ISP to give an example of email which looks like spam to them and provide the message header which may give more clue on it...Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Also check your domain if it is blacklisted somewhere.. http://www.mxtoolbox.com/blacklists.aspx Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|