Hi All, I installed Exchange server 2007 with no edge transport server. I removed SSL certificate from IIS and CA. I removed SSL and TLS for POP, IMAP and SMTP. But I want to secure my SMTP with TLS.I created SSL certificate and I enabled this certificate for SMTP in Exchange server. I configured outlook to use tls for smtp. But without TLS also my outlook is connecting to my email server. What are the options I need to enable to use secure SMTP communication between outlook and exchange server. Now its acting as a open relay server. I want to stop open relay. I want to configure my Exchange 2007 server can send SMTP authenticated users mails only. That meens my users has to authenticate from POP and SMTP. My Idea is to stop the openrelay.If any body can help me I would be thankful to them.Thanks,reddy