Article ID: 121563, created on May 13, 2014, last review on May 16, 2016

  • Applies to:
  • Plesk for Windows


When a user attempts to authenticate via Mail Enable webmail following following error occurs:

'Unknown or Disabled User!' 


There are several reasons why this issue may occur. These are listed below in order of probability:

  1. The account or password was specified incorrectly.

  2. The account being used has been disabled in the MailEnable Administration program.

  3. The IME_ADMIN account does not have the correct permissions to access the CONFIG and POSTOFFICES folder and their sub-folders, usually they are located in C:\Program Files (x86)\Parallels\Plesk\Mail Servers\Mail Enable\.
    Following errors could be found in event logs, for example:

    General: (MailEnable Authentication TD Provider error: 0) An error occured when accessing the resource: "C:\Program Files (x86)\Parallels\Plesk\Mail Servers\Mail Enable\CONFIG\AUTH.TAB" as user "SERVER\IME_ADMIN". The error reported was: (5) Access is denied. 
  4. Web mail has been disabled for this user.


  1. In the first case you, please make sure that specified credentials are correct. For additional information, please refer to MailEnable documentation.

  2. Open the Administration Program and select the account that is being used to access web mail. Right click on the mailbox and ensure that it is enabled and active for use.

  3. Reconfigure the permissions using MEInstaller.exe. Run this binary and select the first option Common installation(file permissions) option which will configure all the permissions for MailEnable. It will ask for password, you can mention any random password into it. By the default, this utility located in the following directory:

    C:\Program Files (x86)\Parallels\Plesk\Mail Servers\Mail Enable\Bin\MEInstaller.exe"
  4. This is a feature of MailEnable Enterprise and can be enabled by viewing the Service Selection mailbox properties in the administration program, ensure the web mail service is "Enabled" for that mailbox. Also ensure that the web mail is enabled for the post office.

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