False friend alert! In the context of written correspondence and e-mails, objet is similar to the English "subject" (sometimes written "RE").

What is an object in an email?

You can use the Mail object to access information about the mail currently being processed. This can either be an outgoing message that is being rendered or an incoming message.

What do you put in the subject of an email?

The subject line should communicate exactly what the email is about so that the recipient can prioritize the email's importance without having to open it. For example, writing “Do you have a sec?” is vague, says Augustine, since the reader will have to open the email or reply to figure out what you want.