Enterprise Email, European Sovereignty
Professional email that rivals Exchange and M365 in every feature — without sending a single byte of data outside the European Union. Custom domains, shared mailboxes, 100GB storage, and ironclad encryption.
Everything you expect from enterprise email
Powerful features your team needs, hosted where your data belongs.
Custom Domains
Use your own domain for professional email addresses. Add unlimited domains and aliases with full DNS management support.
Shared Mailboxes
Collaborate on shared inboxes like info@, support@, and sales@ with assignment, tagging, and collision-free replies.
100GB Storage
Generous per-user mailbox storage so your team never has to archive or delete important messages. Expandable upon request.
Calendar & Scheduling
Integrated calendar with free/busy lookup, room booking, scheduling assistant, and shared team calendars. CalDAV compatible.
Mobile Apps
Native iOS and Android apps with push notifications, offline access, and full feature parity. Also supports ActiveSync and IMAP.
S/MIME Encryption
End-to-end encryption with S/MIME certificate management. Sign and encrypt emails with industry-standard security.
Spam & Phishing Protection
Multi-layered threat detection with AI-powered filtering, DMARC/DKIM/SPF enforcement, and real-time link scanning.
Email Archiving
Automatic archiving for regulatory compliance. Configurable retention policies, legal hold, and full-text search across archives.
Admin Console
Centralised management for users, groups, policies, and settings. Delegate administration with role-based access control.
Migrate from Exchange or M365 with zero downtime
Our automated migration tools move your entire email history, contacts, calendars, and folder structures from Exchange Server, Exchange Online, or Microsoft 365. No data left behind.
- Full mailbox migration including emails, folders, and rules
- Calendar events, recurring meetings, and room bookings
- Contacts and distribution lists
- MX record cutover with zero-gap mail delivery
- Dedicated migration engineer assigned to your project
Supported migration sources
Microsoft 365 / Exchange Online
Full mailbox, calendar, and contacts migration
Exchange Server (2013+)
On-premises Exchange with EWS or MAPI
Google Workspace
Gmail, Calendar, and Contacts via API
IMAP-compatible servers
Any IMAP server including Dovecot, Zimbra, and more
Documents
Edit attachments inline
Contacts
Unified address book
Chat
Message from inbox
Security
Unified threat detection
Deeply integrated with the entire stack
UnionStack Email is not a standalone product. It's tightly integrated with collaboration tools, security policies, and endpoint management for a seamless experience.
Edit document attachments without leaving your inbox. Start a video call from an email thread. Apply DLP policies across all communication channels. One platform, zero friction.
Replace Exchange with confidence
Join hundreds of European organisations that have moved their email to UnionStack. Full feature parity, total sovereignty, zero compromise.