This article provides the information about the working installer of SmarterMail 13x with MachPanel.
This article applies to MachPanel build v5.1.11
Error MSG: Operation Failed. Details: Server was unable to process the request. --> User not found
Please download SmarterMail 13x from the following link and the above error will automatically disappear.
http://www.smartertools.com/Downloads/SmarterMail/CustomBuilds/13.0.5422.18038/SmarterMail13_Setup.exe
We posted a thread on SmarterMail forum and got response from there:
http://portal.smartertools.com/community/a788/server-was-unable-to-process-request_-user-not-found_.aspx