Microsoft Exchange Online Protection (EOP) is a cloud-based email filtering service that helps protect your organization against spam and malware, and includes features to safeguard your organization from messaging-policy violations. EOP can simplify the management of your messaging environment and alleviate many of the burdens that come with maintaining on-premises hardware and software.

The following are the primary ways you can use EOP for messaging protection:

  • In a standalone scenario   EOP provides cloud-based email protection for your on-premises Microsoft Exchange Server 2013 environment, legacy Exchange Server versions, or for any other on-premises SMTP email solution.
  • As a part of Microsoft Exchange Online   By default, EOP protects Microsoft Exchange Online cloud-hosted mailboxes.
  • In a hybrid deployment   EOP can be configured to protect your messaging environment and control mail routing when you have a mix of on-premises and cloud mailboxes.
– definition from Technet
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