Where is the Auto Allow entry created when an email is sent to an external recipient?

When an email is sent to an external recipient, the Auto Allow entry is created in the X-Permitted Senders Group. This group is designed to manage and facilitate the flow of emails to and from external domains while maintaining compliance with SPF (Sender Policy Framework) checks.

The purpose of the X-Permitted Senders Group is to automatically permit senders that have been validated as legitimate, making it easier for Mimecast to handle email routing without disrupting the email delivery process. When emails are sent externally, the system recognizes the sender and adds an entry in this group, which effectively allows future communications from that sender without needing additional manual actions.

Other groups, such as the Blocked Senders Group or the Whitelist Group, serve different functions. The Blocked Senders Group is utilized for managing unwanted or harmful email sources, while the Whitelist Group is generally used for defining trusted senders. Managed Senders may involve a broader classification, but the X-Permitted Senders Group specifically addresses the need for convenience and security for external communications, making it the correct answer.