BREAKING CHANGE

Hi,

The changeling for v. 1.7 lists a “BREAKING CHANGE” and then says what is different. But it doesn’t say under what circumstances things would break. So maybe it could say something like, “if you have written something in your functions.php that depends on the old behavior of the wp_mail() you should check your code to make sure it will still work right with a binary return value. OTHERWISE YOU SHOULD BE OK”. Something like that. Otherwise it’s going to be hard to upgrade to a version that says BREAKING CHANGE as the first two words of the change log.

https://wordpress.org/plugins/sendgrid-email-delivery-simplified/