When you are outside of the C.S. department network, you will need to use a secure connection (STARTTLS) in order to relay email through the C.S. email server. These settings also work inside the department, so you can always use the same SMTP settings. The following section will explain how to connect securely using STARTTLS and SMTP AUTH.
General Configuration values for SMTP AUTH/STARTTLS/SSL
The SMTP server should be set to mail.cs.duke.edu, this will allow access to the mail server's certificate, without a warning message.
The secure STARTTLS port is 25. In some circumstances, you may need to use port 465, as some ISPs and hotel networks will block port 25, as a spam-fighting measure.
If you have any questions please contact the Lab Staff.