Hello,
Thank you for getting back to us. Your YAML looks correct, so the most likely issue is the file structure you're using. If possible, I suggest opening a ticket with our support team so they can review your configuration. If that isn't an option, I recommend doing a fresh install and examining how SmarterMail arranges its files. Make sure you're placing them in the same structure. After that, it should bring up a conversion wizard similar to what appears when migrating from Windows to Linux.
Kind regards,
Zach Sylvester
Software Developer
SmarterTools Inc.
www.smartertools.com