Hi I AM using Asp Cdo Message to send an automatic email. I have used my companies Exchange server as Smart Host in SMTP Virtual Server. <BR><BR>It works fine if the mail is sent with in the corporate domain but if I have to send mail to external environment like hotmail and Yahoo then it gives me an error. <BR><BR>Please guide me that what I security changes I have to make to Relay the message to outside world<BR><BR>Piyush<BR>