However, the SMTP event in the transport pipeline where the antispam agent is registered is also very important in determining the order that antispam agent acts on messages. A lower value indicates a higher priority, so typically, an antispam agent with priority 1 acts on a message before an antispam agent with priority 9. Like all transport agents, each antispam agent is assigned a priority value. For more information, see Enable antispam functionality on Mailbox servers. Typically, you enable the antispam agents on a Mailbox server if your organization doesn't have an Edge Transport server, or if it doesn't do other antispam filtering on incoming messages.

To learn more about Microsoft 365 or Office 365 antispam protection, see Anti-spam protection in EOP. In Exchange 2016 and Exchange 2019, configuration and management of these agents is available only in the Exchange Management Shell.įor more antispam features and easier management, you can purchase Exchange Online Protection (EOP), which is part of Microsoft 365 and Office 365. Exchange uses transport agents to provide antispam protection, and the built-in agents that are available in Exchange Server 2016 and Exchange Server 2019 are relatively unchanged from Exchange Server 2010. However, Microsoft Exchange provides a layered, multifaceted approach to reducing these unwanted messages. No single tool or process can eliminate all spam. Spammers, or malicious senders, use a variety of techniques to send unwanted email into your organization.

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