They emailed you, a total stranger, doesn't that tell you all you need to know? Schools that are legit and of decent quality won't generally go trolling the net, finding the email address of random foreigners, and offering them jobs that are of high quality. SSuch an actions defies logic, though to be honest logic often flies out the window when dealing with the ESL world. Still. it sounds very fishy to me, and I'd say don't even reply. A good school will easily find teachers, and has zero need to go trolling for them. ONly very poor quality schools, at least in my experience, will resort to such tactics. I could be wrong, but why risk it?

Also, I am aware of a lot of scam emails being sent to people offering jobs in the Maldives, I myself have gotten such emails in the past, they are always a scam. Not sure what it is about the Maldives, but it must be a popular place that people want to go for it to be used so often in this scam, never been inclined or cared enough to check the place out. Anyhow, I'd says it's a scam of some kind, and that you should avoid it.