Alert emails from Site24x7, by default, will be sent from "noreply@site24x7.com"

Users can customize the sender email address by logging in and navigating to Admin > Report Settings > Customize Report > Sender Email Address.

Here, you can see a drop-down populated with the email addresses of all the users added to the Site24x7 account. Select the email ID that you want to set as the sender email address and make other changes, if necessary and click Save.

Sender email address