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How to Troubleshoot Blocked Outgoing Emails in Outlook Work Account
Question details
The user is unable to send emails from their work account and needs to identify the cause of the delivery restriction.
- Product
- Microsoft Outlook / Exchange
- Device & OS
- not provided
- Scenario
- Attempting to send an outgoing email from a work account but the message gets blocked or fails to deliver.
- Observed behavior
- Outgoing emails are not being sent, often returning a bounce message or non-delivery report (NDR) due to storage limits or Exchange configuration issues.
Verify your internet connection and ensure you have your IT administrator's contact information, as some diagnostic steps require Exchange admin privileges.
Check Mailbox and Cloud Storage Limits
A full mailbox or Microsoft cloud storage will restrict your account from sending new emails.
When your account exceeds its storage quota, Exchange automatically halts outgoing message delivery. Clearing space is the fastest way to restore functionality.
Open your web browser and navigate to outlook.office.com, then sign in with your work credentials.
Click the gear icon in the top right corner to open Settings, then navigate to General > Storage.
Check your mailbox and Microsoft cloud storage usage. If either is full, delete large attachments, old emails, or unnecessary files to free up space.
Review Non-Delivery Reports (NDRs)
Bounce messages contain specific error codes that explain exactly why an email was blocked.
Run a Message Trace in Exchange Admin Center
Administrators can trace email delivery paths to pinpoint where and why a message was blocked.
Boost Your Productivity with WPS Office
While resolving your Exchange email delivery issues, consider WPS Office for a lightweight, highly compatible alternative to Microsoft Office. Create, edit, and share documents effortlessly without hefty subscription fees.
- 1. Download the installer: Visit the official WPS Office website and click the Free Download button.
- 2. Install the software: Run the downloaded file and follow the on-screen instructions to install the application.
- 3. Open and edit attachments: Launch WPS Office to easily open and edit documents saved from your emails with full formatting preserved.
Frequently Asked Questions
Why am I suddenly unable to send emails from my work account?
Common causes include reaching your mailbox or cloud storage limit, changes in your organization's Exchange configuration, expired authentication, or strict message policies triggering delivery restrictions.
How do I check if my Outlook mailbox is full?
Log in to Outlook on the web, click the Settings gear icon, and navigate to General > Storage. Here you can view your current mailbox usage and overall Microsoft cloud storage limits.
What is a message trace and who can run it?
A message trace is a diagnostic tool in the Exchange Admin Center that tracks an email's path from sender to recipient. Only your organization's IT administrator has the permissions required to run it.
Should I post my bounce message details in public support forums?
No. Bounce messages and message headers often contain sensitive personal and organizational data. You should always share this information privately with your IT administrator.
