"Unsubscribe" refers to the action of removing your email address from a company's mailing list, thereby indicating that you no longer wish to receive any future emails or communications from them.

The "Unsubscribe" button is used to facilitate the unsubscribing process and directly relay that information to the Email Service Provider (ESP), ensuring a simplified subscription process.

Here's how to "Unsubscribe":

1. Choose an email message.

2. Locate the "Unsubscribe" button.

3. Click on "Unsubscribe."

4. Congratulations, you have successfully "Unsubscribed" from the mailing list.

It's important to note that in some cases, the "Unsubscribе" button may not be visible. Therefore, some newsletter emails may not have this feature, such as those requiring you to send an email to the sender to unsubscribe.

In such cases, you will need to scroll to the bottom of the emails and search for the "Unsubscribe" link. The link may be incorporated within a sentence.

Clicking on the "Unsubscribe" link will redirect you to the mail server's website, where you can proceed with the "Unsubscribe" process.

P.S. Please be aware that this is a Premium function only.