Hello Jay. Typically these listings will arise if/when the aspx, html, or other code pieces have been maliciously edited, or when a user mistakenly shares an infected file via file storage within SmarterMail. We're glad to hear you were able to get this resolved, and likely this was an infected file that had been shared previously. Our first recommendation on issues like this is to leverage the tools available via Google to crawl your site and check for malicious content. Typically when listed in Google's autonomous systems, there is an associated reason stored with it that can be accessed via the Google Webmaster Tools or the link below:
Being that your scans are coming back clean at this point, I think you should be good to go with this. Adding the SSL certificate will further protect your server as well, so thats great news!