MS POST study guide
MS POST · Work through your exam, one topic at a time.
The Microsoft 365 Certified: Messaging Administrator Associate credential is aimed at IT professionals who run email for an organization on Exchange Online, Exchange Server, or a hybrid of both. It signals that you can keep mail flowing, keep it secure, and keep recipients working across an environment that mixes cloud and on-premises components. The MS POST study guide has 7 sections and about 2,281 words.
01Manage organizational settings and resources
This domain tests tenant- and organization-level configuration rather than individual mailbox tasks: accepted domains, remote domains, address lists, role-based access control (RBAC), retention, and organizational sharing. Expect questions that ask which setting controls a behavior and which scope or policy wins.
339 words, about 2 min02Plan and manage the mail transport architecture
This domain tests how messages enter, route through, and leave Exchange Online and hybrid Exchange. Know connector selection, MX and smart hosts, TLS, accepted domains, routing boundaries, and the transport pipeline.
359 words, about 2 min03Plan and implement a hybrid configuration and migration
This domain tests coexistence between on-premises Exchange and Exchange Online: the Hybrid Configuration Wizard (HCW), free/busy, OAuth, migration endpoints, batches, and cutover versus staged versus hybrid migration. The HCW configures hybrid connectors, accepted domains, OAuth, and organization relationships.
324 words, about 2 min04Secure the messaging environment
This domain tests protection layers in Exchange Online: EOP anti-spam and anti-malware, Defender for Office 365 anti-phishing, Safe Links, Safe Attachments, quarantine, zero-hour auto purge (ZAP), alert policies, and encryption controls. Anti-phishing policies provide spoof intelligence, impersonation protection for users and domains, mailbox intelligence, and safety tips.
307 words, about 2 min05Manage mail flow
This domain tests day-to-day control of message routing and handling: transport rules, connectors, accepted and remote domains, distribution group expansion, moderation, journaling, message trace, and NDR troubleshooting. Transport rules evaluate conditions and exceptions in priority order; the first matching rule with Stop processing wins.
311 words, about 2 min06Manage recipients and mailboxes
This domain tests recipient objects and their lifecycle: user, shared, room, and equipment mailboxes; distribution and mail-enabled security groups; contacts and mail users; permissions; retention; archive; hold; and mailbox moves. A shared mailbox is not tied to a licensed user, but it needs a license when it exceeds the 50 GB limit or when archive or advanced features are required.
331 words, about 2 min07Manage recipient access and authentication
This domain tests how clients authenticate and connect: modern authentication, OAuth, MFA, Conditional Access, authentication policies, client access rules, OWA and ActiveSync policies, and legacy protocol controls. Modern authentication uses OAuth and supports MFA and Conditional Access.
310 words, about 2 min