LANMailServer is a local mail server, that enables sending and receiving emails within your own network with a standard email program, e.g., Microsoft Outlook, Windows Mail, Mozilla Thunderbird. To send emails to internet, only the computer where LANMailServer is installed must have internet access.

Within the network, emails (text emails, HTML emails, and emails with attachments) can be sent locally to other configured email users in own network. Local email users can also send emails to internet or receive emails from external POP3 and IMAP mailboxes. LANMailServer can be used with LAN connections and dial-up connections (Dial-Up Networking).

Main Features of Email Server for Windows

Setup of local email accounts so that local users can communicate with each other using a POP3-capable or IMAP4-capable email program, e.g., Outlook, Thunderbird, etc.
Optionally, LANMailServer can be used as a pure SMTP Relay Server without email accounts.
Setup of email groups so that emails can be sent to a group. LANMailServer email server distributes emails to individual local users (email distribution).
Emails from external email accounts can be retrieved and assigned to local users. External email accounts that comply with the POP3/IMAP4 standard (including SSL encryption, SSLv3-TLS v1.2/v1.3) are supported.
Autoresponder function for local email accounts. If a user is on vacation, an Autoresponder can be activated and/or emails can be forwarded to another local user or an external email address.
Adding a DomainKey signature and/or digital S/MIME signature to emails being sent.
LANMailServer mail server can also be used as an alternative to AVM KEN! or IIS SMTP Relay. Of course, the full functionality of the KEN! server is not replicated, but only the functionality of the email server.
LANMailServer runs as a Windows service in the background, no user needs to be logged in on Windows machine.
More Features...

WebMail

Any web-based system that supports IMAP and SMTP can be used with LANMailServer, e.g., RoundCube or SquirrelMail.

What's New in LANMailServer?

29. October 2025 LANMailServer 7.10 available

If SMTP access from a server to the Internet is impossible or blocked by a firewall, email sending can now be configured via HTTP using Microsoft Cloud/Microsoft Graph/SMTP2Graph (maximum email size: 4 MB) or Amazon SES (maximum email size: 10 MB) for each individual local email account. Configuration must be done separately for each local email account, as Microsoft and Amazon SES only allow the authenticated email address as the sender. The faster SMTP-based sending should always be preferred. Bulk email sending—e.g., using SuperMailer—via HTTP is not recommended.
Fixes errors in data storage via MySQL. During simultaneous database access, memory was not released, causing the service’s memory usage to accumulate over days or weeks.
Fixes character encoding errors in UTF-8 encoded emails received via IMAP4 by the email client. The issue only occurred with emails that were not properly encoded in base64 or quoted-printable.
For external mailboxes with size limits for retrievable emails, an info email is sent to the local mailbox so that the oversized email can be retrieved manually later via WebMail or another email client.
The guide for installation and configuration of ClamAV/ClamWin with LANMailServer has been updated. The original version from clamav.net is now used, as the old version no longer received signature updates

02. July 2025 LANMailServer 7.03 available

Autoresponder has answered twice when email will left in local mailbox
Fixes an exception while stopping service when there are email clients connected via IMAP 4 IDLE command.
Version 7.03
- Fixes an application hung while stopping/restarting service