Fortunately, I am a suspicious person and ignore most inquiries about buying my art, especially when it is from someone in another country. The flag for me is often the poor grammar, and poor spelling.
I have sold a piece of art online to a local person who emailed me with an inquiry. But it was a local person, I knew who she was, and the rest of the story ended happily ever after. She loved the piece, agreed to the price, and bought it for her husband for his birthday.
But I have encountered those emails that raise my eyebrow, and I listen to my gut. Follow the link listed here for an article of such scams.
Off to check out an inquiry about my cards. This one wants to know if I can expedite the shipping of my cards for a birthday. This may be legit, but since I am sick, and moving slowly, I am sure I missed her deadline. I will write her back however, and see what it is about.