From our YC app we explained that our plan for adoption would focus on add-ons for existing email clients to display the markup and to capture metadata when ema

From our YC app we explained that our plan for adoption would focus on add-ons for existing email clients to display the markup and to capture metadata when emails are composed (Gmail and Chrome extensions, plugins for Outlook, Thunderbird, etc). We would also for partnerships with email marketing companies like ConstantContact and MailChimp to add these to their templates. The idea would be to charge the companies running campaigns for API calls made from the end users' email clients (SaaS model).