before Yosemite I would create HTML emails using Coda and then open them up in Safari and then File -> Share -> Share as email. This would open a new mail message with my HTML file rendered in the body of the email as a webpage. Now when I follow these same steps in Yosemite the mail message opens up blank. I do not want to send through Mailchimp or the like because these are one-off emails that I customize before sending to each recipient. Help!