Simon Butler, aka Sembee,  Microsoft Exchange Server MVP, author of the technical articles at amset.info, and Director of Sembee Ltd.

Over the weekend one of my clients suffered an authenticated user attack on the SMTP interface of the Exchange 2003 server. This was detected by the monitoring tool I use, HoundDog, now GFI MAXRead the rest of the article.

Very interesting article and a list of user names that this MVP has seen used for spamming.  Also a brief explanation of how he successfully used HoundDog Software to keep on top of this and head-off a growing problem before it became a real problem.