Microsoft 365 Messaging (MS-203) Exam Practice Questions & Study Guide 2026
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What is MS-203 — Microsoft 365 Messaging?
The MS-203 exam is a Microsoft certification that validates your skills and knowledge as a Microsoft 365 Messaging professional. Whether you're looking to advance your career, get a pay raise, or simply prove your Azure expertise — this certification is your next big step.
Passing MS-203 tells employers one thing — you know your stuff. And with the cloud industry growing faster than ever in 2026, Azure certified professionals are in higher demand than ever before.
Everything You Need to Pass MS-203 — In One Place
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Question 1
You have a Microsoft Exchange Server 2019 organization. You create a retention policy. You need to ensure that all email older than one year is moved to an archive mailbox. What should you use?
A. a data loss prevention (DLP) policy
B. a retention policy tag
C. a default policy tag
D. a personal tag
Question 2
You have hybrid deployment between a Microsoft Exchange Online tenant and an onpremises Exchange Server 2019 organization. The deployment uses Azure AD Connect. All incoming email is delivered to Exchange Online. You have 10 mail-enabled public folders hosted on an on-premises Mailbox server. Customers receive an error when an email message is sent to a public folder. You need to ensure that all the mail-enabled public folders can receive email messages from the internet. The solution must ensure that messages can be delivered only to valid recipients. Solution: From Azure AD Connect, select Exchange Mail Public Folders. Does this meet the goal?
A. Yes
B. No
Question 3
You have a hybrid deployment between a Microsoft Exchange Online tenant and an onpremises Exchange Server 2019 server. Users report that the email they send to external recipients is marked as spam. You need to validate the Reverse DNS and Sender ID data for the on-premises server. What should you use in the Microsoft Remote Connectivity Analyzer?
A. Inbound SMTP Email
B. Outbound SMTP Email
C. Message Analyzer
D. Exchange Online Custom Domains DNS Connectivity Test
Question 4
You have a hybrid deployment between a Microsoft Exchange Online tenant and an onpremises Exchange Server 2019 organization. The deployment contains an Exchange Server 2019 server named Server1. Server1 has a public certificate named Cert1 that is bound to the SMTP protocol. Cert1 will expire soon. you replace Cert1 with a new certificate named Cert2 from a different public certification authority (CA) After you replace the certificate, you discover that email delivery between Server1 and the Exchange Online tenant fails. You need to ensure that messages can be delivered successfully What should you do on Server1?
A. Return the Hybrid Configuration wizard
B. Restart the MSExchangeTransport service.
C. Recreate the certificate and include an exportable private key.
D. Bind a self-signed certificate to the SMTP protocol.
Question 5
You have a hybrid deployment between a Microsoft Exchange Online tenant and an Exchange Server 2019 organization. You need to enable journaling for outbound email. Where can you store the journal reports?
A. a mail-enabled public folder
B. an Exchange Server 2019 mailbox
C. a Microsoft SharePoint Online document library
D. an Exchange Online mailbox
Question 6
You have a Microsoft Exchange Online tenant that contains an email domain named contoso.com. You have a partner organization that uses an email domain named fabrikam.com. You plan to add a connector to secure the email messages sent from fabrikam.com to contoso.com. You need to ensure that only fabrikam.com can use the connector. What should you do?
A. Configure the connector to verify the contoso.com domain with a certificate.
B. Configure the connector to verify the fabrikam.com domain with a certificate.
C. Add fabrikam.com as a remote domain.
D. Add fabrikam.com as an accepted domain.
Question 7
You have a Microsoft Exchange Online tenant that contains a custom role group named RGI. You need to prevent users assigned to RGI from running a specific cmdlet. Which cmdlet should you run to modify RG1?
A. Remove Entry
B. Remove -ManagementRoleAssignment
C. Set-ManagementScope
D. Disable -Cmd1etExtensionAgent
Question 8
You have a hybrid deployment between a Microsoft Exchange Online tenant and an onpremises Exchange Server 2019 organization. Users report that emails sent from Exchange Online mailboxes to the on-premises Exchange Server mailboxes are undelivered. You need to review the non-delivery report (NDR) for each undelivered email. What should you use?
A. message trace in the Exchange admin center
B. auditing in the Exchange admin center
C. the SMTP protocol logs in Exchange Server
D. the transport logs in Exchange Server
Question 9
You have a Microsoft Exchange Online tenant. Users report that legitimate email messages are delivered to their Junk Email folder. You plan to use the Microsoft Remote Connectivity Analyzer to identify the cause of the issue. Which test should you run?
A. Outlook Connectivity
B. Inbound SMTP Email
C. Outbound SMTP Email
D. Message Analyzer
Question 10
You have a Microsoft Exchange Online tenant. You plan to place a hold on all email messages stored in the mailbox of a user named User1. What should you create first?
A. an eDiscovery case
B. sensitive info type
C. a data loss prevention (DLP) policy
D. an information barrier segment
Nicky Henry
Jun 15, 2026
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Jun 14, 2026
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Raylee May
Jun 14, 2026
Great experience using Dumps4Azure for the MS-203 exam. The questions covered all essential Exchange Online and mail flow topics effectively.
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Jun 13, 2026
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