For Symantec Advanced Threat Protection (ATP) to email notifications, you must configure the connection to a mail server. ATP is compatible with any mail server that supports Simple Mail Transport Protocol (SMTP).
If your mail server requires authentication to send messages, you must set up an account for the appliance on your mail server.
To configure the connection to an SMTP-compatible mail server
In ATP Manager on the Settings > Global page, scroll down to SMTP Server.
Click Edit SMTP Server.
In the SMTP Server field, type the name of your mail server.
In the Port field, type the port that your mail server uses.
In the Appliance email field, type the email address where alerts are sent from.
If your mail server requires authentication to send messages, check Authentication Required. Then type the User name and Password assigned to the ATP appliance.