"YahooYB.zip" is a used by Yahoo to verify domain ownership for its Yahoo Business Mail or Yahoo Small Business (now Turbify ) services . What is YahooYB.zip?
: Inside that HTML file is a specific alphanumeric code that Yahoo’s automated system looks for when it crawls your site. How to use it Download the file from your Yahoo/Turbify control panel. Extract the HTML file from the ZIP folder. YahooYB.zip
When you sign up for a business email service using a domain you bought elsewhere, Yahoo needs to confirm you actually own that domain. They provide this ZIP file for you to upload to your web server. What is inside the file? The contents are very simple and usually include: "YahooYB