How Gmail tracks unsubscribes

Hey @Adam B,

Although it’s true that theoretically, Gmail won’t track/see when someone unsubscribes from a Klaviyo email, that’s not to say it won’t impact your deliverability. Unsubscribes are only a part of how Gmail and other inbox providers use to determine your sending reputation. Other aspects that impact your deliverability include how engaged your recipients are (opens and clicks), how often recipients mark your email as spam, to name a few. 

Additionally, when recipients use the list unsubscribe function built into the Gmail UI, that would actually trigger an unsubscribe event in Klaviyo. This way those contacts will be suppressed going forward.

Further outreaches to these contacts who have explicitly opted out will be in violation of a number of regulations including CAN-SPAM, GDPR, CASTL, and others. 

If you haven’t had a chance to yet, I would suggest taking a look at some of our resources on this topic such as the Help Centers below:

• Understanding email deliverability
• Understanding and monitoring email deliverability performance
• Understanding deliverability best practices
• How to strengthen your sender reputation

We also have a great Deliverability certification academy course that goes over a lot of the basics of understanding deliverability that could be helpful to take. 

David