Notion Mail Shutting Down? AI Agents Have Taken Over!

Notion Mail (which was acquired by Notion after purchasing startup Skiff) is being sunsetted on September 22nd, 2026. Why? Because over half of Notion Mail’s users didn’t even check their email because they used AI agents instead.

Notion Mail wasn’t a failed product. In fact, Notion Mail went GA in April 2025 with strong AI capabilities such as auto-tagging, intelligent filters, and scheduling. Notion Mail competed with paid email clients like Superhuman. But instead of competing against another email client, Notion Mail was replaced by AI agents that users trusted more than their UI.

1What replaces a product when AI replaces the user?

Notion is doubling down on this trend, stating that they are “going all in on using agents to run your inbox.” Even though their AI agents will continue to work, Notion is removing the UI for managing email. Users will still be able to process emails, but they won’t have an app to do so.

Many other startups are following suit. Startups like AgentMail are creating email clients that cater to AI agents rather than humans. These startups believe that users will soon fully outsource their email management to AI agents. And the UI is just getting in the way.

What this really shows is how AI will transform industries. As email clients become smarter, faster, and more effective at prioritizing emails, users decided to let AI agents take over and never open their inboxes again. If no one opens their inboxes, then there’s nothing left to optimize. Notion saw this coming sooner than others.