MAPI Security

Definitions

1. The protection of Microsoft Messaging Application Programming Interface access, which is used by Outlook and related clients to interact with Exchange mailboxes and messaging data. MAPI security matters because mailbox access can expose email, calendars, contacts, and delegated privileges if authentication or access policy is weak.

   In plain English: Security for the protocol and access paths used by Outlook and Exchange mail clients.

   Example: "The team tightened MAPI security by limiting legacy client access and enforcing stronger authentication for mailbox sessions."

Related Terms

• Business Email Compromise
• DKIM
• DMARC
• Email Authentication
• Email Bombing
• Email Spoofing
• End-to-End Encryption
• PGP