Simple definition
Exchange Online Protection (EOP) is Microsoft’s cloud-based email filtering service for spam, malware and other unwanted messages.
Technical definition
EOP evaluates incoming and outgoing mail using multiple filtering layers, including connection and reputation checks, anti-malware scanning and anti-spam policies. Actions depend on the tenant’s configured protection policies.
What is EOP used for?
Reduce spam, malicious attachments, phishing attempts and unwanted messages before they reach users.
Practical example
An administrator can review a message quarantined by an anti-spam or anti-malware policy before deciding whether it should be released.
Common problems
- False positive
- Anti-spam policy too permissive
- Connector bypassing certain controls
Related terms
To be noted: precise behaviors and commands may vary depending on the versions, products and architectures.