When configuring the Email subsystem for delivery of Email notifications, at the very least the To and From fields must be configured.

The File field is used to specify a file on the filesystem that must be sent with all notification Email messages. This file is inserted as the message text, not as an attachment.

The Overriding Domain is used to forge the sender Domain Name in the outgoing Email message. This might be necessary, for example, if this device is located behind a firewall whose IP Address resolves to a different Domain Name than this device. For SPAM protection, many SMTP servers perform reverse lookups on the sender IP Address to ensure the Email message is really from who it says it's from.

An Email can be sent based on a CP Group trigger. When the specified value matches the current value of the group, an Email message is sent.

For testing purposes you can send a Email immediately by pressing the Send Email button.