The Complete Self-Hosted Webmail
nxtMail is a complete, self-hosted webmail platform for organisations that want modern email without giving up control of their data. A full standalone client — not a plugin — it connects to any IMAP/SMTP server (Microsoft 365, Gmail, Dovecot, Postfix or on-premise) and pairs a fast, AI-assisted interface with enterprise security, multi-tenancy and compliance.
Key Capabilities
Universal IMAP/SMTP
Connect any standards-compliant mail server with intelligent threading and a fast, modern reading experience.
AI Writing & Search
Compose assistance, smart replies, summarisation and natural-language semantic search across the providers you choose.
Calendar, Tasks & Contacts
A full calendar with recurring events and Google/Microsoft sync, integrated tasks, a rich address book and notes.
Multi-Tenant by Design
Database-per-tenant isolation lets providers deliver branded webmail to many customers from one deployment.
Real-Time Sync & PWA
IMAP IDLE push, server-sent events and an installable progressive web app with offline support.
Enterprise Security
JWT/RS256 auth, TOTP 2FA, OAuth2, encrypted credentials, rate limiting, audit logging and Shadow-DOM email isolation.
Built For Privacy-First Organisations
Managed Service Providers
Deliver branded, multi-tenant webmail with isolated data for each customer.
On-Premise Enterprises
Run alongside Exchange, Workspace or open-source mail with full data sovereignty.
Privacy-First Sectors
Government, legal, healthcare and finance needing audit trails and data residency.