How to Fix MailEnable 'Unknown or Disabled User' Error

Introduction

If you are running MailEnable on your Windows server and encounter the "Unknown or Disabled User" error during login, it usually means the MailEnable service is not properly authenticated with Windows policies.

This guide will show you how to fix the issue step by step, even if you are new to Windows server administration.

MailEnable "Unknown or Disabled User" Causes

• Misconfigured Windows Group Policy
• Missing permissions for the administrator account
• MailEnable services are not restarted after configuration changes
• IIS is not refreshed after updates

Steps to Solve MailEnable Login Issues

Step 1: Update Group Policy Settings

The most common solution for fixing MailEnable login issues is adjusting the Windows Group Policy to allow administrator rights.

1.1 Open Group Policy Editor

1. Press Win + R, type gpedit.msc, and press Enter.
2. In the Local Group Policy Editor, navigate to:

Computer Configuration > Windows Settings > Security Settings > Local Policies > User Rights Assignment

1.2 Edit the Policy

1. In the right-hand pane, find the policy called: Act as part of the operating system
2. Right-click it and select Properties.

1.3 Add the Administrator Account

1. Click the Add User or Group button.
2. Enter administrator (or the account used for MailEnable services).
3. Click OK to save changes.

Step 2: Restart IIS and MailEnable

After updating the policy, you need to restart services so that the changes take effect.

2.1 Restart IIS

Open Command Prompt as Administrator and run:

iisreset

This will restart IIS (Internet Information Services), which is required for MailEnable login to function properly.

2.2 Restart MailEnable Services

1. Press Win + R, type services.msc, and press Enter.
2. Locate MailEnable SMTP, MailEnable POP, and MailEnable IMAP.
3. Right-click each service and select Restart.

Step 3: Verify MailEnable Login

Now, try logging into your MailEnable account again:

• If the login works, the "Unknown or Disabled User" issue is resolved.
• If the error persists, double-check that the administrator account was correctly added in Group Policy.

Conclusion

By following this guide, you have:

• Updated Group Policy to grant administrator rights
• Restarted IIS using iisreset
• Restarted MailEnable services

This resolves the MailEnable "Unknown or Disabled User" error and ensures smooth MailEnable login for your users.