To start with the Mercury first download the latest binary package from here.
Next step is to create a folder and unzip downloaded package in it.
Now you can run it with:
sh bin/start.sh
Next step is to explore "bean-console":
http://localhost:8080/bean-console
In bean console go to "DeploymentManager",
then "deployedModules" and follow "mercury-mail-suite" and
at the end "mercury.StorageManager". After that you will be on the url:
http://localhost:8080/bean-console/[DeploymentManager]/deployedModules/[mercury-mail-suite]/[mercury.StorageManager].
(You can get there as well just by clicking the link above)
In "StorageManager" you can:
cat folderYouMountedBeanWebdav/[DeploymentManager]/deployedModules/[mercury-mail-suite]/[mercury.smtp.LoggingConnectionHandler]
echo >folderYouMountedBeanWebdav/[DeploymentManager]/deployedModules/[mercury-mail-suite]/[mercury.smtp.LoggingConnectionHandler] ".*"