How does Mimecast treat entries in the Permitted and Blocked Senders lists?

Mimecast’s handling of the Permitted and Blocked Senders lists demonstrates a clear prioritization process to enhance email security and ensure legitimate communications. The system is designed such that entries in the Permitted Senders list will take precedence over those in the Blocked Senders list.

When an email arrives, Mimecast first checks whether the sender is in the Permitted Senders list. If the sender is found there, the email is allowed through, regardless of any entries in the Blocked Senders list. This method ensures that emails from trusted sources are delivered without hindrance, thereby minimizing false positives and ensuring important communications are not interrupted.

This prioritization reflects the intention to maintain a smooth workflow for users, allowing essential communications to bypass potential filtering issues that could arise from the Blocked Senders list.