Nice website and interesting option of email provider. However, I haven’t been able to find much information about the company providing the service beyond “Mango Mail is an American company based in the state of Florida”. That (i.e, the limited information about the company, not the location) could be a deal breaker or, at least, a cause for concern for some people. It would be for me.

Some small providers are completely transparent about how small they are and share the information about the company. See, for example Purelymail https://purelymail.com/about .

Edit/note: To be clear, the point I tried to make has nothing to do with the location of the provider but about the lack or limited information about the company.