So a client frantically called saying that their email isn’t working. A quick check and it turns out the whole site was down. Further checking revealed the problem was that the domain name had expired. Called the client and asked where they had registered the domain name. Huh? After explaining what I meant, they said they had absolutely no idea. Another design company had registered it years ago and they didn’t have the information. Lesson to learn: Make sure you know who has your domain.