'%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 Different SCL Scores Between Exchange Online and Outlook.com
Question details
Users experience different Spam Confidence Level (SCL) scores when sending messages between Exchange Online tenants and Outlook.com, despite passing all email authentication protocols.
- Product
- Exchange Online and Outlook.com
- Device & OS
- not provided
- Scenario
- Troubleshooting email delivery and spam filtering discrepancies between Microsoft email services.
- Observed behavior
- Messages receive different SCL scores in Exchange Online versus Outlook.com even when SPF, DKIM, DMARC, ARC, and composite authentication all pass successfully.
Ensure you have administrator access to the Microsoft 365 Admin Center and have the full message headers and message trace details ready for the affected emails.
Investigate SCL Factors and Escalate via Microsoft 365 Support
Since SCL discrepancies are driven by Microsoft's internal reputation and threat intelligence algorithms, you will need to escalate the issue to Microsoft Support with proper documentation.
Even when email authentication protocols (SPF, DKIM, DMARC, ARC) pass, Microsoft's Spam Confidence Level (SCL) scoring heavily relies on sender and IP reputation, message content, recipient-specific filtering rules, and global threat intelligence.
Additionally, configuring an outbound connector in Exchange Online does not bypass or control Outlook.com's separate inbound filtering mechanisms.
Collect the full internet message headers from the affected emails in both the Exchange Online sent items and the Outlook.com inbox or junk folder.
In the Exchange Admin Center, navigate to Mail flow > Message trace. Document the sender domain, recipient domain, timestamps, and message trace results.
Log in to the Microsoft 365 admin center, navigate to Support > Help & support, and open a new ticket.
Provide the gathered headers, domains, and message trace details in the ticket so Microsoft can investigate the tenant license, domain reputation, and specific filtering triggers.
Looking for a Seamless Office Suite Experience?
While troubleshooting Exchange routing and Outlook SCL scores can be complex, your daily document work doesn't have to be. WPS Office provides a lightweight, highly compatible alternative to Microsoft Office for all your word processing, spreadsheet, and presentation needs.
- 1. Download the Installer: Visit the official WPS Office website and download the free installation package.
- 2. Install WPS Office: Run the installer file and follow the simple on-screen instructions to set up the software.
- 3. Open Your Documents: Launch WPS Office and instantly open your existing Microsoft Office files without losing any formatting.
Frequently Asked Questions
Why do my emails have a high SCL score even with proper SPF, DKIM, and DMARC?
While SPF, DKIM, and DMARC authenticate your domain's identity, Microsoft's Spam Confidence Level (SCL) also evaluates the actual content of the message, IP reputation, sender history, and global threat intelligence data. If any of these factors flag your message, the SCL score can still be high.
Can I use an outbound connector to bypass Outlook.com spam filtering?
No. Creating an outbound connector in your Exchange Online tenant does not control, bypass, or influence the inbound filtering mechanisms used by Outlook.com consumer mailboxes.
What information does Microsoft Support need to investigate SCL discrepancies?
You should provide full internet message headers from both the sender and recipient sides, sender and recipient email addresses, domains, exact timestamps, and a detailed message trace report downloaded from the Exchange admin center.
