Self-hosted apps that integrate with IMAP/SMTP

5 open-source, self-hostable projects list IMAP/SMTP as an integration.

• FriendicaFriendica is a self-hosted, open-source decentralized social network connecting to the Fediverse via ActivityPub, Diaspora, and other protocols.
• Enigma 1/2 BBSENiGMA½ is a self-hosted, open-source BBS in Node.js with Telnet, SSH, WebSocket, native FidoNet mail, indexed file bases, DOS door emulation, and ActivityPub federation.
• KurrierKurrier is an open-source, self-hosted workspace unifying email, calendars, contacts, and file storage via IMAP/SMTP, CalDAV, CardDAV, and WebDAV/S3 with OIDC/SSO auth.
• dobaseOpen-source, self-hosted workspace combining eight tools — mail, kanban, docs, chat, tasks, files, calendar, video — into one tiling interface on your server.
• pinchySelf-hosted AI agent platform adding enterprise guardrails to OpenClaw — scoped permissions, RBAC, signed audit logs, connectors for Odoo, email, Telegram, local LLMs.