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Set Up a Default No-Reply Email Address
Use an org-wide system email address to send your customers automated email about their cases. To include case details and customize your email template, create a verified custom No-Reply address. Otherwise, when you turn on Send Case Notification from System Address, email notifications for incoming emails on existing cases, Case Comment, Case Escalation, and Case Assignment send from noreply@salesforce.com. Emails sent from noreply@salesforce.com can’t be customized for security reasons and don’t include case details or customer information.

