Replay mail

You're referring to "replay mail" or "replay email"!

Replay mail is a feature that allows you to send a response to an email that you've received, but with a twist. Instead of sending a new email, you can "replay" the original email and add your response to the original message.

This feature is often used in situations where you want to keep the original email thread intact, or when you want to add a response to an email that you've already replied to. It's also useful when you want to send a follow-up email to someone who has already responded to your original email.

Here's an example of how replay mail works:

1. You receive an email from someone and you want to respond to it.
2. You compose your response and click the "Replay" button.
3. The original email is inserted into the response, followed by your new message.
4. The replayed email is sent to the original sender, keeping the original email thread intact.

Replay mail is a convenient feature that can save you time and effort when responding to emails. It's also a great way to keep track of email conversations and maintain a clear record of communication.