542mail
Enterprise Email Management Platform
A comprehensive self-hosted alternative to Microsoft 365. Email management, smart classification, document handling, calendar, internal chat, and video meetings — all under your control.
Currently in Development — Seeking Early Adopters
We're building a comprehensive email platform and looking for organisations to pilot. Register your interest to participate.
At a Glance
Your Communications, Your Infrastructure
Data Sovereignty
Cloud email means your data on someone else's servers. M365 and Google scan emails for advertising and AI training. Your communications deserve better.
Compliance Requirements
Regulatory frameworks increasingly mandate data locality. Self-hosted email gives you complete control over where your data lives and who can access it.
Vendor Lock-In
Rising subscription costs and proprietary formats make migration increasingly difficult. 542mail gives you freedom from vendor dependencies.
Professional Email Management
Multi-Account Support
Connect IMAP, POP3, Microsoft 365 (OAuth2), Gmail accounts in one unified interface.
Smart Classification
Automatically organise emails by clients, vendors, and projects using rule-based and domain-based classification.
Rich Composition
WYSIWYG editor, email templates with variables, per-account signatures, scheduled sending.
Folders & Labels
System folders plus custom folders with colours, icons, and nested organisation.
Real-Time Sync
Background sync daemon with 30-second intervals, SSE progress updates, desktop notifications.
Advanced Search
Full-text search, filters by sender, date, attachments, classification.
Email Intelligence for Business
Relationships
Client & Vendor Management
Link emails to specific clients and vendors. Track communication history per relationship. Project-based organisation.
- Protocol numbers for tracking
- Email type categorisation (Invoice, Contract, Report, Quote)
- Communication history per client
- Project-based organisation
Intelligence
Automatic Classification
System categories for WordPress, backups, security alerts, server notifications. Domain-based auto-classification rules.
- Contact timeline showing complete email history
- Create rules from existing emails via context menu
- Domain-based auto-classification
- System categories for common notifications
Attachments Under Control
Document Management
Auto-Extraction
Automatic extraction and storage of all email attachments.
Virus Scanning
ClamAV integration scans every attachment before storage.
Type Classification
Categorise as Invoice, Contract, Quote, Report, etc.
Smart Inheritance
Documents inherit classification from source email.
Document Browser
Filter by type, client, vendor with preview support.
Source Linking
Link documents back to their source emails.
Integrated Calendar System
Scheduling
Calendar Features
A full-featured calendar system integrated directly into your email platform.
- Month, Week, Day, and List views
- Personal and shared calendars
- Event creation with colours and all-day support
- Birthday reminders from contacts
Global
International Support
Built for organisations operating across borders with comprehensive international calendar support.
- Holidays API covering 50+ countries
- Greek holidays and name days (522 names tracked)
- Country selector for international teams
- Planned: Google Calendar sync, Outlook sync, CalDAV support
Team Communication Built-In
Internal Chat
Messaging
Messaging Features
Real-time team communication without relying on third-party services.
- Direct messages (1:1) and group conversations
- Real-time WebSocket messaging
- Typing indicators
- File attachments in chat
Awareness
Presence & Status
Know who is available and communicate naturally within your organisation.
- Online presence indicators
- WhatsApp-style message alignment
- Planned: Read receipts, @mentions, channels, voice messages
Face-to-Face Without Third Parties
Video Meetings
Conferencing
Self-Hosted Video
Video conferencing that runs entirely on your own infrastructure.
- Self-hosted Jitsi integration
- Start video calls directly from chat
- Screen sharing support
- No third-party services required
Privacy
Complete Privacy
Every meeting stays within your control, from start to finish.
- All meeting data stays on your infrastructure
- Insert meeting links directly in email composition
- Planned: Meeting recording, AI transcription
Enterprise Security Built-In
OAuth2 Authentication
Microsoft 365 and Gmail OAuth2 integration.
Virus Scanning
ClamAV integration for all attachments.
XSS Protection
HTML email sanitisation prevents cross-site scripting.
Audit Logging
Complete activity logging, ISO 27001 ready.
Access Control
Role-based (superadmin, admin, user) with per-account permissions.
Shared Mailboxes
Controlled access with read, send, delete, manage permissions.
Let the System Work for You
Automation & Rules
Rules
Rule Engine
Automate your email workflow with flexible, powerful rules.
- Conditions based on From, To, Subject, Body
- Actions: Move, Label, Mark read, Forward
- Create rules from existing emails via context menu
Automation
Auto-Classification
Let the system organise your emails automatically based on intelligent rules.
- Domain-based automatic classification
- Planned: Visual workflow builder
- Planned: Auto-responders, scheduled actions
- Planned: Escalation rules
Intelligence Coming Soon
AI Integration (Planned)
Smart Classification
AI-powered email categorisation beyond rules.
Reply Suggestions
Context-aware smart reply generation.
Email Summarisation
TL;DR for long email threads.
Writing Assistant
Composition help with tone adjustment (formal/friendly).
Document Analysis
Key information extraction from attachments.
Natural Language Search
"Find invoices from last month" style queries.
AI features require significant CPU/memory resources on the hosting VPS.
Modern, Scalable Architecture
Technical Foundation
Stack
Technology Stack
A modern, production-grade stack designed for performance and reliability.
- FastAPI (Python 3.12+) — Async backend
- React 18 (TypeScript) — Modern frontend
- PostgreSQL 16 + pgvector — Full-text search, vector storage
- Redis — Caching, task status, real-time
- Celery — Background processing
- Jitsi Meet — Video conferencing
- ClamAV — Antivirus
- Docker — Containerised deployment
Infrastructure
Infrastructure Requirements
Flexible deployment options to match your organisation's needs.
- Minimum: 4 CPU cores, 8GB RAM, 100GB SSD
- Recommended: 8+ cores, 16GB+ RAM (for AI)
- Ubuntu 22.04 LTS or Debian 12
- Single VPS or distributed deployment
- Docker Compose setup included
Where We Are Now
Development Status
Progress
Current Progress
- 90 features implemented and working
- 23 features partially implemented
- 159 features planned
- Core email: Complete
- Calendar with holidays: Complete
- Internal chat: Mostly complete
- Video meetings: Working (Jitsi)
- AI integration: Planned
Timeline
Roadmap
- Q1 2026: AI classification, advanced search
- Q2 2026: PWA support, mobile optimisation
- Q3 2026: CRM features, email campaigns
- Q4 2026: ERP integration capabilities
Join the Early Adopter Program
542mail is being built for organisations that value data sovereignty. Early adopters will influence the roadmap and get a platform configured for their specific needs.
- Organisations currently paying for M365 but concerned about data privacy
- Consulting firms managing multiple client communications
- Companies in regulated industries requiring data locality
- IT teams looking for self-hosted alternatives
- Influence feature priorities and roadmap
- Priority support during pilot phase
- No commitment required to register interest
Ready to Take Control of Your Email?
Join our early adopter program and help shape the future of self-hosted enterprise email. Register your interest today.