Your Email Server
Email Relay Settings allow you to send survey invitations/reminders using your own email server. This interface allows you to specify the settings that are required to authenticate the outgoing invitations. Email relay should be used only when participants are not able to receive emails from an outside server. When using email relay, you will not be able to track who the emails have been delivered to.
To learn more about configuring Email relay Settings, Goto Outbound Email Settings.