How can create business mail of my store?

Regarding creating business mail of your store

You can subscribe to any email provider and we will run it for you with our domain, we support all email service providers

Free email services such as
Zoho Mail
https://www.zoho.com/mail

Microsoft
https://products.office.com/en-us/business/compare-office-365-for-business-plans

You can subscribe with any of them or any other provider and let us know about the domain

If you want to do this free of charge, the best providers of this service are free
Is a site
zoho.com

To implement this on the site
Zoho

After entering this the next link
https://mail.zoho.com/biz/mailsignup.do?plan=free
enter your data as shown in the image

You will then see this page to enter the activation code sent to your phone

Here you choose to create an email as described

Then it will show you the desired page
Just chose another

To show you the required code as shown

Now you can add the code to your domain as shown in the pictures steps
Calculate Invoices ... Domains ... Domain