hi everyone,we have exhange 2003 in our organisation, 3 front end and 3 backend clusteri have one problem that is one user is sending 1000 of mails but when we ask the user he said he did not sent this, and we have checked the IIS logs that we found the external IP is showing for login.because of this our mail queue is so large , temporary we stop this user to send mail to outside domain, but we cant do this for long,can we restrict that public IP for login in exchange 2003 and blocked sending mail.regardsjeevan singh

Hope fully your server is not open for relay (or else how public IPs are loggin in your exchnage). Check with this link http://www.amset.info/exchange/smtp-openrelay.aspIf it is open , follow this http://technet.microsoft.com/en-us/kb/kb00324958.aspxRaj

no,our server is not configured for open relay, user cant send mail to outside domain without using their credential.jeevan

Cool.. so follow the steps and block the IP http://msexchangetips.blogspot.com/2006/08/exchange-block-host-ip-from-sending-e.htmlRaj

hi,thanks so much , i tried this and let u know regardsjeevan

Hi,Open Exchange System Manager -> Go to the required sever unser administrator group -> Protocols -> SMTP -> SMTP virtual Server -> Properties -> Access you can manager through Connections or Relay RestrictionsRegards,Krishnahttp://smtpport25.wordpress.com

You can also use below Tool to see which client is doing much transactions on server. Using the Microsoft Exchange Server User Monitor (ExMon) tool Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

thanks to all regards,jeevan