Spam confidence level (SCL)
Microsoft assigns a spam confidence level (SCL) to inbound messages that go through spam filtering and are assigned a spam score. That score is mapped to an individual spam confidence level (SCL) that's added to the email. A higher SCL indicates a message is more likely to be spam.
| SCL Value | Description |
|---|---|
| -1 | The message skipped spam filtering. For example, the message is from a safe sender, was sent to a safe recipient, or is from an email source server on the IP Allow List. |
| 0, 1 | Spam filtering determined the message wasn't spam. |
| 5, 6 | Spam filtering marked the message as spam. |
| 8, 9 | Spam filtering marked the message as high confidence spam. |
For more information, see Spam confidence level (SCL).