I have an application called sendy installed in the following setup: https://sendy.domain.com/
This works fine on a Digital Ocean droplet LAMP install.
Sendy is an email platform that allows you to send emails via AmazonSES.
It has a feature to use custom domains for tracking clicks etc. You add the custom domain and then it tells you to add it as a CNAME that points to the sendy install.
I have a wildcard SSL on domain2.com which is hosted elsewhere.
However, I get security errors which I assume is some sort of name mismatch thing?
Is there something I need to do with the letsencrypt certificate on https://sendy.domain.com/?