I have setup and Exchange server 2003 on a windows 2003 domain. The exchange server is not a domain controller. I'm having an issue with spam and I was wondering is there any software that I can load on the server to assist with this. I set the IMF but that don't seem to help too much. I hear that exchange 2007 is more secure, but I'm not ready to make that change at this point. Any help and advise is appreciated.