Obtaining your account number is the first step in Centurylink Business Email Login. You can do so by going to the CenturyLink website and entering your zip code. After entering your zip code, you will be presented with a list of available plans in your area. The procedure of signing up is quick and straightforward. Enter your CenturyLink account number, contact info, and billing info. After completing the sign-up process, you will be able to access your CenturyLink services. Contact CenturyLink customer support immediately away if you are having issues with your email setup or connection.