Is it appropriate to start a sentence with the following words on an email;
Mmm, this is quite an odd question. I suspect it's an argument over whether you can start a sentence with because, and you're asking me to adjudicate. Am I right?
Regardless, the answer is you can start a sentence with all of those words. Some might frown at a sentence starting with because, and I would avoid it personally, but it's grammatically feasible.