Can anyone recommened any tools / addonsto monitor mail massage queuesin exchange 2003? We have some users who are sending out bulk emails and would like to track then down. Freeware or shareware recommendations appreciated.

Performance monitor can track queue size and you can use it to set alerts. http://technet.microsoft.com/en-us/library/aa997513.aspx

Thanks for the swift response! I was looking for a tool which I could view the actual individual mail leaving the exchange server. We have some users abusing our systems and sending bulk mailshots. any advice would be appreciated.