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Custom policies always take precedence over the default policy, but you can change the priority (running order) of your custom policies.
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For greater granularity, you can also create custom outbound spam policies that apply to specific users, groups, or domains in your organization.
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For more information, see Anti-spam protection.Īdmins can view, edit, and configure (but not delete) the default outbound spam policy. Admins are automatically notified of suspicious outbound email activity and blocked users via alert policies.ĮOP uses outbound spam policies as part of your organization's overall defense against spam. Suspicious outbound messages are marked as spam (regardless of the spam confidence level or SCL) and are routed through the high-risk delivery pool to help protect the reputation of the service (that is, keep Microsoft 365 source email servers off of IP block lists). Outbound spam from a user in your organization typically indicates a compromised account. In Microsoft 365 organizations with mailboxes in Exchange Online or standalone Exchange Online Protection (EOP) organizations without Exchange Online mailboxes, outbound email messages that are sent through EOP are automatically checked for spam and unusual sending activity. Microsoft Defender for Office 365 plan 1 and plan 2.Want to experience Microsoft 365 Defender? Learn more about how you can evaluate and pilot Microsoft 365 Defender.