Add the cooled pasta, salmon, peppers, onion, and celery to a large mixing bowl. Toss to evenly combine then set aside.
1 16 oz box medium shells pasta, 4 6 oz cans boneless, skinless salmon, 2 red bell peppers, 1 bunch green onions, 3/4 - 1 cup diced celery
In another bowl combine the mayonnaise, lemon juice, seasonings, capers, and dill- stirring until evenly combined.
1 1/4 cups mayonnaise, 1/2 tbsp lemon juice, salt and pepper, 1/2 tsp onion powder, 1/2 tsp cajun seasoning, 2 tbsp drained capers, 1 tbsp fresh dill
Pour the dressing over the pasta mixture toss together gently until everything's evenly incorporated.
Cover the bowl and refrigerate for 2 hours to chill.
Give the salad a good stir, serve, and enjoy!