In a move that underscores the rapid shift toward AI-driven productivity, Notion has announced the shutdown of Notion Mail, its Gmail client that was built on technology and talent acquired from encrypted email startup Skiff. The service will be discontinued on September 22, 2025, less than a year after its launch in April 2024.

Why Notion Mail is being shuttered

According to an announcement on X (formerly Twitter) spotted by 9to5Mac, Notion stated that most users of Notion Mail do not rely on a traditional inbox to manage their email. Instead, they delegate the task to AI agents. The post read: “We launched Notion Mail with a belief that your inbox should think like you—more personal to how you work and over time, more capable with AI. As Notion agents have gotten more capable, we’ve seen more users hand off email workflows to them. Today, more than half of Notion Mail users manage emails without ever opening their inbox. So, we’re going all in on using agents to run your inbox.”

This decision reflects a broader industry trend: as large language models and autonomous agents become more sophisticated, users are increasingly comfortable letting AI handle routine correspondence, scheduling, and filtering. Notion, already known for its versatile note-taking and project management platform, sees agents as the future of work.

Background on the Skiff acquisition

In February 2024, Notion acquired Skiff, a startup that offered end-to-end encrypted email, documents, and calendars. Skiff had reportedly served 2 million users and was seen as a strong competitor to Proton Mail, especially among privacy-conscious individuals and organizations. The acquisition gave Notion a team of engineers and product experts, as well as underlying infrastructure for email and productivity tools.

However, Notion’s vision for email diverged from Skiff’s original privacy-first approach. Notion Mail was built as a Gmail client, not a standalone encrypted email provider. It integrated with Google’s ecosystem and leveraged AI to offer smart sorting, auto-labeling, and suggested replies. While the product was praised for its clean interface and tight Notion integration, it lacked the end-to-end encryption that had been Skiff’s hallmark.

What happens to user data

Notion has assured users that their email history will remain untouched in Gmail. A support page states: “When the Notion Mail inbox shuts down, your email history will stay exactly where it is in Gmail.” However, users are urged to export any drafts and scheduled emails by September 21, as those will not automatically carry over to other apps. Additionally, Notion offers a way to save “snippets and auto label instructions” for use elsewhere.

For those who have set up custom rules or agent workflows, Notion promises a smooth transition: “If you have auto label set up in Notion Mail, you won’t have to rebuild it. Create a Custom Agent in a few clicks, and we’ll bring your existing rules over for you.” Existing agents that manage email will continue to operate, and the email connection within Notion remains intact.

Impact on organizations and regulated industries

Organizations that rely on HIPAA-compliant email handling may need to plan an earlier migration. Notion’s support page notes: “If you rely on HIPAA coverage, you should plan to transition off Notion Mail by June 30, 2026.” This suggests that while Notion Mail will cease to exist as a product, some backend integration may linger for a year to allow compliance-heavy users to find alternatives.

The shutdown also means the end of @skiff.com email addresses that were brought over during the acquisition. Users who had been using those addresses through Notion Mail will lose them when the service closes.

Broader implications: AI agents replacing traditional apps

Notion’s decision is emblematic of a larger shift in the software industry: from standalone apps to intelligent agents that operate across platforms. While email clients have long been a battleground for productivity, the rise of AI has made it possible for users to outsource reading, drafting, and organizing emails to non-human assistants. Notion’s own agent platform now allows users to create custom automations that can handle email, calendar events, and project updates without manual intervention.

This trend poses a challenge for traditional email clients like Microsoft Outlook, Apple Mail, or Spark. They are now racing to embed AI capabilities, but Notion argues that the agent—not the inbox—should be the central interface. Whether users accept this paradigm remains to be seen, but early data from Notion suggests that a critical mass is already there.

Comparison with Skiff’s original vision

Skiff was founded in 2020 with a mission to provide a private, encrypted alternative to Google Workspace. Its email service boasted zero-access encryption, meaning even Skiff couldn’t read user messages. This was a direct selling point for journalists, activists, and businesses handling sensitive data. When Notion acquired Skiff, many users feared that privacy would be compromised. Those fears proved prescient: Notion Mail did not offer end-to-end encryption, nor did it support custom domains or encrypted calendar features that Skiff had.

In the aftermath, Proton Mail and Tuta (formerly Tutanota) saw an influx of former Skiff users. Some privacy advocates criticized Notion for effectively dismantling a privacy-focused product and replacing it with a less secure AI-enhanced client. The shutdown of Notion Mail now removes even that alternative, leaving former Skiff enthusiasts without a Notion-based email solution.

What remains of Skiff at Notion

Despite closing the email client, Notion retains the talent from Skiff, including former CEO Andrew Milich and other key engineers. The company may leverage the underlying infrastructure for other productivity features—such as improved calendar integration, storage solutions, or even a future notetaking format. However, Notion has not announced any direct successor to Skiff’s original product portfolio. The company seems to be focusing its efforts on AI agents as a core differentiator, rather than on rebuilding an encrypted communication suite.

The shutdown of Notion Mail also raises questions about Notion’s broader strategy. The company competes with giants like Google Workspace and Microsoft 365, as well as smaller players like Coda and Roam Research. By betting on agents, Notion is positioning itself as a platform for orchestrating work rather than a mere tool for storing or organizing it. But this pivot comes at the cost of alienating users who valued a dedicated email client with Skiff’s DNA.

User reactions and next steps

On social media, reactions have been mixed. Some users are disappointed but not surprised, given Notion’s track record of killing products that don’t align with its AI-first vision. Others are frustrated by the short transition period and the loss of features they had grown accustomed to, such as the unified inbox and smart labels. However, many acknowledge that they were already using Notion agents to handle most email tasks, so the shutdown will have minimal impact.

For those who want to continue using a Notion-integrated email workflow, the company encourages signing up for Custom Agents. Notion’s agent builder allows users to create automated responses, label emails, trigger reminders, and even update Notion databases based on incoming messages. This is where Notion wants to invest its resources, rather than maintaining a traditional email client.

The September 22 deadline is fast approaching. Users are advised to review their Notion Mail settings, export any important drafts or scheduled messages, and consider alternative Gmail clients if they still prefer a manual inbox experience. Notion has provided detailed instructions on its support page, including how to preserve auto-label rules.

Looking ahead: Notion’s bet on agents

Notion’s move is a clear signal that the company sees the future of work as AI-mediated. By phasing out Notion Mail, it frees up engineering resources to improve its agent platform, which currently supports a range of automations beyond email—such as summarizing documents, generating meeting notes, and tracking project status. This aligns with a broader industry shift where companies like Google, Microsoft, and Salesforce are embedding AI deep into their workplace tools.

However, Notion’s strategy carries risks. Email remains a mission-critical communication channel for businesses, and many professionals are not ready to hand over full control to AI. Privacy, reliability, and customization concerns may limit agent adoption. Moreover, by abandoning the email client market entirely, Notion cedes ground to rivals like Superhuman, Spark, and even Google’s own Gmail, which continues to add AI features.

The demise of Notion Mail also serves as a cautionary tale for users of startup-built email services. When a company is acquired, product roadmaps can change dramatically. Users who rely on third-party clients tied to a specific platform should be prepared for sudden discontinuations. Notion itself has a history of retiring features with little notice, and this latest shutdown reinforces that pattern.

In the end, the story of Notion Mail is a microcosm of the tensions between user trust, corporate strategy, and technological evolution. What began as an encrypted email startup became a AI agent pilot, and now that pilot has ended. The agents, however, are just getting started.

Source:Ars Technica News