New Microsoft 365 Account Cannot Receive Emails

Hi Diana May,

Thank you for posting your question on the Microsoft Q&A forum.

If a new Microsoft 365 account can send emails but cannot receive any, the issue is usually related to mailbox provisioning, licensing, or mail flow configuration. You may want to check the following:

1/ Confirm the mailbox is created and licensed

Sometimes a new account exists but the Exchange Online mailbox has not been fully provisioned yet.

• Go to Microsoft 365 Admin Center
• Navigate to Users > Active users
• Select the affected user
• Check Licenses and apps, then click to expand the Apps section.

Verify that:

• The user has a license that includes Exchange Online Exchange Online is enabled for that license.

If you make any change, please allow 30 - 60 minutes for the mailbox provisioning process to complete.

2/ Test whether the mailbox can receive emails

Send a test email and check the mailbox using Outlook on the web: https://outlook.office.com

If the message appears in Outlook on the web, the mailbox is working correctly, and the issue may be related to the email client configuration.

3/ Check Junk, Quarantine or mailbox rules

In some cases, emails are delivered but filtered automatically.

In Outlook on the web:

• Check the Junk Email folder
• Check Deleted Items
• Go to Settings > Mail > Rules: Ensure there are no rules automatically moving or deleting incoming messages.

Administrators may also check in Microsoft 365 Defender > Email & collaboration > Review > Quarantine

4/ Verify the domain DNS configuration

• Go to Microsoft 365 Admin Center by admin account
• Navigate to Settings > Domains Select your domain Check the DNS records

Ensure the MX record points to Microsoft 365. If the MX record is missing or pointing to another service, incoming emails will not be delivered to the mailbox.

5/ Check Mail Flow rules 

Administrators should verify that no mail flow configuration is blocking incoming messages.

• Open Exchange Admin Center
• Go to Mail flow > Rules
• Ensure there are no rules that block or redirect inbound mail.

6/ Confirm the mailbox exists in Exchange

Administrators should check:

• Open Exchange Admin Center
• Go to Recipients > Mailboxes
• Search for the affected user

If the user is not listed, the mailbox may not have been created yet. In this case, removing and reassigning the license can trigger mailbox provisioning again.

I hope this information helps. If you have any additional questions, please feel free to let me know.

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For a new Microsoft 365 account that can send but not receive email, the most common cause is domain/DNS configuration.

Follow these steps in order:

1. Verify the domain in Microsoft 365
   • In the Microsoft 365 admin portal, confirm that the custom domain used for the mailbox is fully verified.
   • If the domain is not verified, incoming messages will not be delivered to the mailbox.
2. Check the MX record for the domain
   • In the Microsoft 365 admin portal, go to the DNS Settings for the domain.
   • Confirm that the MX record for the domain points exactly to the value shown there (the Microsoft 365/Exchange Online MX record).
   • If the MX record still points to another mail system or is missing/incorrect, external senders will not be able to deliver mail to the mailbox.
3. Allow for DNS propagation
   • After correcting or adding the MX record, DNS changes can take time to propagate.
   • It may take up to 72 hours before all senders on the internet route mail correctly to the new Microsoft 365 mailbox.
4. If the MX record must remain elsewhere
   • If the MX record must continue pointing to another mail system (for example, during a staged migration), configure one of the following:
     • A hybrid deployment so that the existing system forwards mail to Microsoft 365 mailboxes, or
     • Forwarding from the current mail host to the Microsoft 365 Online Email Routing Address (domain.onmicrosoft.com) for the user.

If the domain is verified, the MX record points to Microsoft 365, and sufficient time (up to 72 hours) has passed, incoming mail should start arriving in the mailbox.

References:

• Email messages aren't received for a new domain that you add in the Microsoft 365 portal