When a user has a Managed Senders list, which will always supersede it?

When considering the Managed Senders list in the context of Mimecast and email security, a Trusted Senders policy created by an Administrator will always supersede it due to the hierarchical nature of email security policies. Administrators have the ability to enforce broader security measures across the organization, which includes establishing policies that dictate which senders are considered trustworthy.

Such a policy serves as a standard for all users within the organization, ensuring that it cannot be bypassed by individual users' lists. This maintains a consistent and secure approach to handling incoming emails and protects the organization from potential threats.

The other options either pertain to user-defined preferences or specific conditions that may not apply universally, making them less authoritative than the overarching policies set by administrators.