Your e-mail address is an asset of your business and you invest in the

e-mail address you use every time you give out a business card, piece of
marketing material, or run an ad with it included in the ad. You are
teaching the world that to communicate with you by e-mail, send e-mail to
that e-mail address. If you ever changed e-mail addresses, for any reason,you would probably not receive e-mail sent to the “old” e-mail address. What about a customer who sends e-mail to you at the “old” e-mail address? If you do not receive the e-mail, you can’t respond. What is the cost of potential lost business?

All you need for a Permanent email Address is a domain and email forwarding.