Why is there a folder in my email with a name like “@sanex4yzdb8a?"

Our software creates this folder momentarily as a mechanism to see what appropriate file naming formats are for your server.  Normally we delete the test folder immediately after the test succeeds.  

The folder should be empty.  

• If it is, you can delete that folder. 
•  If that folder isn't empty, please create a Support request so we can look into this further.