CURLOPT_MAIL_FROM(3) on macOS

The text 390c45304633, as macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

SMTP sender address

CURLOPT_MAIL_FROM(3) on macOS now