Bring a large pot of generously salted water to a boil. Add the macaroni and cook according to package directions.
Drain and rinse under cold water.
Meanwhile, in a large bowl, combine mayonnaise, vinegar, tomatoes (and all of the juice from the tomatoes), olives, onion, garlic powder, oregano salt and pepper. Mix well.
When the pasta is done, mix it in and serve right away room temperature or chilled.