I have a windows 2003 R2 server with Exchange 2007 installed. There is a machine on our network which is spamming i believe but cannot find it. The Queues are filling up with spam from various addresses. I can't find any info on the machine anywhere. I want to know how to
1. Stop mail from non authenticated user from sending and
2. How to find the machine sending this crap.
I have enabled logging on the SMTP sender so i can see what is sending (but it just says my mail server.) I have asked this question a number of time and keep getting referals to articles which have no relevance to my issue. I simply need to find the best way to stop unauthenticated users sending mails and where this machine is....