This test ensures that the List-Unsubscribe mailto: option is present in your emails. List-Unsubscribe is designed to help reduce complaints by providing subscribers an alternative method to safely unsubscribe without negatively impacting your sending reputation.
How it works
When a campaign is sent to Inbox Monitor, Inbox Optimizer checks the message header using the first reference seed received. This test checks to see if the List-Unsubscribe header and mailto: tag is used in the message header.
The focus of this test is the mailto: tag, which is more widely supported by mailbox providers such as Gmail and Outlook.com (Hotmail).
- Pass: If the List-Unsubscribe header and mailto: tag are found
- Fail: If no List-Unsubscribe header or mailto: tag is found