'%3e%3cpath%20d='M8%200C12.4183%200%2016%203.58172%2016%208C16%2012.4183%2012.4183%2016%208%2016C3.58172%2016%200%2012.4183%200%208C0%203.58172%203.58172%200%208%200ZM11.6162%204.38379C11.2257%203.99337%2010.5927%203.99338%2010.2021%204.38379L8%206.58594L5.79785%204.38379C5.40732%203.99334%204.77429%203.99329%204.38379%204.38379C3.99331%204.77429%203.99335%205.40733%204.38379%205.79785L6.58594%208L4.38379%2010.2021C3.99348%2010.5927%203.99341%2011.2257%204.38379%2011.6162C4.77426%2012.0066%205.40734%2012.0065%205.79785%2011.6162L8%209.41406L10.2021%2011.6162C10.5927%2012.0066%2011.2257%2012.0067%2011.6162%2011.6162C12.0067%2011.2257%2012.0066%2010.5927%2011.6162%2010.2021L9.41406%208L11.6162%205.79785C12.0066%205.40735%2012.0066%204.77429%2011.6162%204.38379Z'%20fill='%23080E17'%20fill-opacity='0.46'/%3e%3c/g%3e%3cdefs%3e%3cclipPath%20id='clip0_3761_713'%3e%3crect%20width='16'%20height='16'%20fill='white'/%3e%3c/clipPath%3e%3c/defs%3e%3c/svg%3e)
How to Fix Exchange Online Archive Mailbox Full and Email Delivery Problems
Question details
Users are unable to receive new emails because their Exchange Online archive mailbox has reached its maximum storage limit.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Managing and reducing mailbox storage to restore normal email delivery functionality.
- Observed behavior
- The archive mailbox hits its quota, blocking incoming emails and prompting the user to delete archive content and empty the Deleted Items folder.
Ensure you have Exchange Administrator credentials for your Microsoft 365 tenant, as applying retention policies and running PowerShell commands require elevated permissions.
Manually Clear Mailbox Storage and Empty Deleted Items
The fastest way to restore incoming email delivery is to manually delete unnecessary emails and completely empty the Deleted Items folder to free up immediate space.
When an Exchange Online mailbox or its archive hits the storage quota, all incoming mail flow stops. Manual deletion is the quickest method to get below the limit while permanent retention policies are being configured.
Log into your Outlook Web App (OWA) or desktop client, navigate to Settings, and check your current mailbox and archive storage usage to identify the largest folders.
Navigate to your In-Place Archive folders and permanently delete large attachments, outdated emails, or unnecessary system notifications.
Right-click the 'Deleted Items' folder in both your primary mailbox and archive mailbox, then select 'Empty Folder' to permanently purge the space.
Configure and Assign Retention Policies
Create and assign retention tags to automatically move or delete older items to prevent the archive mailbox from filling up again.
Force Retention Processing Using PowerShell
Administrators can manually trigger the Managed Folder Assistant to process retention policies immediately rather than waiting up to seven days.
Enhance Your Productivity with WPS Office
While resolving your Exchange Online email delivery issues, consider optimizing your daily document workflows. WPS Office is a powerful, lightweight, and free alternative to Microsoft Office that easily handles your productivity tasks and integrates seamlessly with any email client.
Frequently Asked Questions
Why am I not receiving emails when my Exchange archive is full?
Exchange Online enforces strict storage quotas. When your primary or archive mailbox exceeds these maximum limits, the system halts all incoming email delivery until sufficient space is freed up.
How long does it take for retention policies to apply in Exchange Online?
By default, it can take up to seven days for Exchange Online's Managed Folder Assistant to automatically process and apply new retention policies across a mailbox.
What does the Start-ManagedFolderAssistant PowerShell command do?
This command allows Microsoft 365 administrators to immediately trigger retention processing on a specific mailbox, clearing out expired items and enforcing policies without waiting for the scheduled seven-day cycle.
