jmap

Mailwell is a native Mac mail app unifying Gmail, iCloud, Fastmail, Kagi Mail, Microsoft 365 and any IMAP/JMAP server into one inbox, with local storage, no tracking, and optional AI features including read-only MCP access for Claude.

WMail is a native iPhone email app for Fastmail with JMAP support, offering features like Masked Email, Send Later, Templates, Quick Reply, Pause Inbox, and Newsletter Bundles.

Stalwart v0.16 is a major release featuring a complete architectural rebuild with a new WebUI, unified JMAP-based management replacing REST API, external OIDC authentication support, and a new CLI tool for administration and infrastructure-as-code workflows.