Cook pasta according to package directions, omitting salt and fat. Drain and rinse with cold water; drain.
Combine pasta, tomatoes, dill, and spinach in a large bowl, tossing gently to combine.
Combine lemon rind and next 5 ingredients (lemon rind through pepper) in a small bowl, stirring with a whisk. Drizzle over pasta mixture; toss gently to coat. Top with salmon.