Although that kind of move is a lot easier than moving to a new home, it can still be a hassle. Here are some suggestions for smoothing the process.
1. Don't lock yourself into your ISP's domain. For example, if you're moving from, say, SBC to Comcast, you might be tempted to use your new Comcast email address. That's fine, but what happens if you decide to switch to a different ISP again? You'll face the same hassle all over again.
Instead, start using a Web-based email service you can keep forever and access regardless of who supplies your Internet service. That means Gmail, Outlook.com, Yahoo, or a similar provider.