LanMail setup tutorial

LanMail — Fast, Private Intranet Messaging Solution

What it is

LanMail is an intranet-focused messaging and email system designed to run on a local network (LAN) for organizations that need fast, private internal communication without relying on external cloud providers.

Key benefits

• Low latency: Messages and attachments travel over the local network, giving near-instant delivery.
• Privacy: Data stays inside your network, reducing exposure to external servers.
• Offline resilience: Can function when internet connectivity is unavailable or intermittent.
• Cost control: Avoids per-user cloud fees and reduces bandwidth costs for large attachments.
• Simplicity: Easier compliance with internal policies and localized administration.

Core features

• Local SMTP/IMAP/POP support for standard email clients
• Webmail and lightweight mobile/web UI for quick access
• End-to-end or transport encryption options (TLS on transport; optional client-side encryption)
• Attachment handling optimized for LAN (peer-to-peer transfer, LAN caching)
• Directory integration (LDAP/Active Directory) and single sign-on support
• Admin dashboard: user management, logs, quota, and backup controls
• Optional gateway for selective internet relay (outbound/inbound) with policy rules

Typical use cases

• Small-to-medium businesses wanting internal-only mail
• Schools, research labs, manufacturing plants with restricted internet access
• Disaster recovery sites and ships or field offices with intermittent internet
• Organizations with strict data residency or regulatory requirements

Deployment and maintenance

• Deployable on a single server or clustered for redundancy.
• Requires routine backups of mailstores and config, monitoring of disk usage and queues, and patching of the mailstack.
• Integrates with existing DNS and internal routing; optional outbound relay to the internet if needed.

Considerations and trade-offs

• Limited reach: not a replacement for public email if communicating with external partners.
• Requires local IT expertise to manage security, backups, and upgrades.
• Scaling beyond the LAN (e.g., remote users) needs secure VPN or federation.

Quick setup checklist

1. Provision a server with stable storage and network access.
2. Install mail server components and LanMail software.
3. Configure directory integration and authentication.
4. Set transport security (TLS) and optional client-side encryption.
5. Configure backups and optional internet relay policies.
6. Test mail flow, web UI, and client connectivity.

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