I’m self-hosting a Ghost blogging site on AWS and use Cloudflare to manage my DNS. Ghost uses Mailgun to send out email newsletters. In order to enable HTTPS email tracking for opens/clicks/unsubscribes, I followed these instructions.
The SSL certificate I have from Ghost is issued by Let’s Encrypt. However my sending email is a subdomain (mg) of my actual domain and in order to enable tracking, I end up going into a second level subdomain (email). Based on the above instructions, it seems I need a 2nd level SSL certificate. It’s nearly the same issue as this user.
I purchased the Advanced Certificate manager. Can someone help me get the necessary 2nd level SSL certificate?