SmarterMail is not shown in Helm Control Panel.
Diagnostics tool in HELM shows the following result:
Test Result Server Status Online SmarterMail Failed to contact Smartermail web service. Please check your service settings.
Unsupported version of SmarterMail is installed.
Install any of the following versions of SmarterMail:
SmarterMail 6.x, 7.x, and 8.x.