-- **Non-Microsoft filters**: If your domain's MX record _doesn't_ point to Office 365 (messages are routed somewhere else first), [secure by default](secure-by-default.md) _isn't available_. If you'd like to add protection, you need to enable Enhanced Filtering for Connectors (also known as _skip listing_). For more information, see [Manage mail flow using a non-Microsoft cloud service with Exchange Online](/exchange/mail-flow-best-practices/manage-mail-flow-using-non-Microsoft-cloud). If you don't want Enhanced Filtering for Connectors, use mail flow rules (also known as transport rules) to bypass Microsoft filtering for messages that the non-Microsoft filtering service already evaluated. For more information, see [Use mail flow rules to set the SCL in messages](/exchange/security-and-compliance/mail-flow-rules/use-rules-to-set-scl).
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