Recently a client of mine moved. Because the client was now living in a different part of town the internet provider was different. The internet provider is usually the company that installs cable or your telephone as well as giving you internet service.
My client's email address was the one that came with the internet provider. The change of providers meant a change in email address also.
Providers give email addresses to their customers for free along with the internet service. That means that they host an email server where all of your email (sent and received) is stored. If you are no longer their customer you must sign up for a new address either with your new provider or with one of the free online providers; Gmail, Yahoo, Hotmail, Zoho. There are more listed here:
It is easy to be confused about email online and email clients. A client is the program that is ON your computer that lets you read your email without going through a browser like Firefox or Internet Explorer. Some common clients are Mail (on the Macintosh), Outlook, Entourage, Windows Live Mail, and Thunderbird. These programs will go and get your mail, put it on your computer and also send your mail from your computer.
It is handy to have one of these programs in case you are somewhere that does not have an internet connection. Using one of these programs without an internet connection you can read any email that was downloaded when you last were on the Internet and you can write email or replies. Anything you write will not be sent right away, but the next time you can connect to the internet they will send automatically. Until they are sent they sit in your inbox and wait.
When I don't have an internet connection and try to go to gmail to get my mail this is what I see.