MailEnable webmail loads very slow or returns to the login form

Symptoms

• Users are unable to list messages after logging in and MailEnable webmail shows "Please wait..." window infinitely

• After entering mail access credentials webmail returns back to the login form

• Unable to create folders or delete emails in MailEnable

• The following messages can be found in Windows Event Viewer > Windows Logs> Application:

  General: (MailEnable Authentication TD Provider error: 0) An error occured when accessing the resource: "C:\Program Files (x86)\Parallels\Plesk\Mail Servers\Postoffices" as user "SERVER\IME_ADMIN". The error reported was: (5) Access is denied.

  Failed to serialise index: D:\MailEnable\Postoffices\example.com\MAILROOT\johndoe\\Inbox. A File Access error occurred when opening the file (was retried for 40 seconds). No data can be written.

Cause

Insufficient permissions for the IME_ADMIN user on the %MAILENABLE_PATH%\Postoffices or %MAILENABLE_PATH%\Config folder.

Resolution

It is required to set correct permissions for the IME_ADMIN. For that:

1. Log into the server via RDP.

2. Run %MAILENABLE_PATH%\Bin\MEInstaller.exe utility

3. Execute action "1. Common Installation (File Permission)"

OR

1. Execute the following command via the command line:

   icacls "%MAILENABLE_PATH%\Postoffices" /grant "IME_ADMIN:(OI)(CI)(F)" /t

   icacls "%MAILENABLE_PATH%\Config" /grant "IME_ADMIN:(OI)(CI)(F)" /t

2. Check any folder inside %MAILENABLE_PATH%\Postoffices or
   %MAILENABLE_PATH%\Config for proper permissions by right-click > Properties > Security.

   If IME_ADMIN still does not have Full Control, right-click on the corresponding folder Properties > Security > Advanced > Replace all child object permission entries with inheritable permission entries from this object > Apply

3. Restart MailEnable Postoffice Connector service:

   sc stop MEPOCS && sc start MEPOCS