- False positives: To temporarily allow certain messages that are still being blocked by Microsoft, use [admin submissions](submissions-admin.md#report-good-email-to-microsoft). By default, allow entries for domains and email addresses, files, and URLs exist for 30 days. During those 30 days, Microsoft learns from the allow entries and [removes them or automatically extends them](https://techcommunity.microsoft.com/t5/microsoft-defender-for-office/automatic-tenant-allow-block-list-expiration-management-is-now/ba-p/3723447). By default, allow entries for spoofed senders never expire.
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