Reader Question: And/But

I got this question on my e-mail:
Can you start a sentence with an "And" or "But"? What are the rules surrounding this issue?
The traditional rules state that it's not correct to start a sentence with these words, but in practice these days it is fine to do so if you want to create a dramatic effect. I wouldn't start too many sentences that way because such sentences stand out.
I hope this has answered your question!