It's a pretty standard scam email. Just because they offer to pay by credit card doesn't mean anything. They often use credit cards that are stolen but not yet reported as such, so may "clear" at first but will always result in a chargeback later.
If you receive an email looking like this, it IS a scam and don't spend any more time on it. Delete it and go back to creating art.
p.s. isn't Luis a male name? gotta love when scammers are stupid...unless Luis is gay and got married to a guy...
From: Luis Huffman [email@example.com]
My name is Luis Huffman, I saw some of your works which i really loved and i will like to purchase them, But i will like to know if you can ship to FIJI ISLAND. I am from Baltimore, Maryland, Got married last year and moved down to Fiji Island with my husband.
In regards to payment do you accept Master credit card. kindly get back to me so i can send you the list of arts i am interested in ordering.
I will await your prompt response,
Baltimore , MD 21244
Tel : (301) 747-6295