How can I access my ISP's email account?

Episode 1390 (2:00:10)

David from Orange County, CA
Gmail

Leo says that using a third party free email account like Gmail to go get his ISP's email accomplishes several benefits:

1) He can change ISPs any time,
2) It has a much better spam filter, and
3) He can have Gmail go get his email automatically and then access it anywhere.