CURLOPT_MAIL_FROM(3) on macOS

The text cbaae2d564e5, as OS X 10.11.6, OS X 10.11.5, OS X 10.11.4, OS X 10.11.3, OS X 10.11.2, OS X 10.11.1, OS X 10.11, OS X 10.10.5 shipped it.

SMTP sender address

CURLOPT_MAIL_FROM(3) on macOS now