It would be nice to get developer input or confirmation of this. After updating from 4.14 to 4.15.1 and 4.16 thereafter, I found that transactional emails through Mailgun stopped working entirely. The error given was the typical “SSL wrong version number” that many have issue with.
The workaround for that was to replace
in your Ghost production configuration file. The problem is that key is now called
secure and so this broke my website upon updating. This change is at least now reflected in the documentation.
edit: I’m bad at typing