Better yet, if you are sending email on a new topic, start a new message with a new subject header.

对啊，我会以为里面是关于这个项目更详细的内容，但打开却发现是截然不同的内容。好，我以后一定记住改掉电子邮件的题目。

youdao

They need the ability to encode the message header---the recipient's address---in a new and detectable way.

ENGADGET: New 'subconscious mode' could improve smartphone battery life, supress your WiFi id