I had ISA working with Exchange 2000 just fine, and now, incoming mail is working, but out-going is not. Any suggestions on where to look first to troubleshoot? We did run the mail wizard, and after that all was working. I am not sure what we changed to tie things up. I have Toms book, so if there are specific pages to reference me to, that would be great. Kapt Kirk kaptkirk@xxxxxxxxxxxx more from the Web. FREE MSN Explorer download : http://explorer.msn.com