Warning Message that user account will expire

Many of my user account has receive an email like this :
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From: cottonsari.com [mailto:baurzhan@swissgrow.com]
Sent: Monday, January 08, 2018 5:00 PM
To: purwaningsih@cottonsari.com
Subject: WARNING:purwaningsih@cottonsari.com closing of your Email Account is been processed

Dear purwaningsih,

Your email account will Expire on 10 Jan 2018,

If you want to continue using your email address: purwaningsih@cottonsari.com

You will need to verify immediately to prevent your account from terminating

All messages and files will be lost if you do not immediately verify

Upgrade Now

This service is free of charge.

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My question is, what should i to respons that message?