Sources

References for the discontinued mail clients mentioned on the home page. For each client the announcement and at least one independent source with a date.

Notion Mail

Notion is shutting down its email client Notion Mail (web, Mac, iPhone) on 22 September 2026. The mail itself stays in Gmail.

Announced: 25 June 2026 · Discontinued: 22 September 2026

Notion Help Center: Notion Mail inbox is going away (25 June 2026)
TechCrunch: Notion Mail shuts down amid agent takeover (25 June 2026)
heise online: Notion Mail wird abgeschaltet (26 June 2026)

Skiff Mail

Notion acquired Skiff in February 2024. Skiff Mail, Pages, Calendar and Drive were shut down on 9 August 2024; Skiff was a hosted email service with its own mailboxes.

Announced: 9 February 2024 · Discontinued: 9 August 2024

Skiff: Migrating your data (offizielle Sunset-Seite) (2024)
TechCrunch: Notion acquires privacy-focused productivity platform Skiff (9 February 2024)

OnMail (Edison Software)

Edison Software shut down its email service OnMail on 31 July 2025. The Edison Mail app continues.

Announced: February 2025 · Discontinued: 31 July 2025

Spam Resource: Email service OnMail to shut down (3 June 2025)
OnMail: Discontinuation notice (Internet Archive) (February 2025)

Postbox

eM Client acquired Postbox on 22 October 2024. Postbox has not been sold or developed since; support ended on 22 December 2024. Installed copies keep running.

Announced: 22 October 2024 · Discontinued: 22 October 2024

eM Client Blog: eM Client acquires Postbox Inc. (22 October 2024)
TidBITS: Postbox Acquired by eM Client, Ends Development (22 October 2024)

Last updated: 20 September 2026