{ "subject": "My Marketing Email Subject", "html": "

Hello World

This is a test email.

", "transfer_encoding": "8bit", "charset": "utf-8", "clients": [ "outlook16", "gmail_chr26_win", "iphone6p_9" ], "image_blocking": false, "spam": { "test_method": "seed", "from_address": "marketing@example.com" } }