Configuring mail servers/content/support/library/data/v78/help/mail_serv_config.aspx
The administrator clicks Send on this message to notify the Data Security system that a workflow operation has been requested.
Use the Mail Servers screen to set up the mail server that should be used to receive email requests for workflow updates—the incoming mail server—as well as the mail server that should be used for sending the notifications—the outgoing mail server. (The same outgoing server is used for alerts and scheduled tasks.)
Click View Complete Document for more.