Comment HTTP 301 (Score 5, Informative) 113
As Anrego says, I'd suggest not actually handing over the domain. Instead, rebuild the site under a new domain while updating key content such as contact links, and then set up an "HTTP 301: permanently moved" redirect to the new site on the new domain. This will transfer your pagerank to the new domain and makes search engines happy. Then, you can keep your email and other domain services under your own control.