How to tell if your Senator reads your letter

Here's an actual letter, with my actual name, but the Senator's deleted:

Dear Dr. Ph.D.:

Thank you for taking the time to write and share your views with me. Your comments will help me continue to represent you and other Californians to the best of my ability. Be assured that I will keep your views in mind as the Senate considers legislation on this or similar issues.

If you would like additional information about my work in the U.S. Senate, I invite you to visit my website, http://[deleted].senate.gov. From this site, you can send a message to me about current events or pending legislation, access my statements and press releases, request copies of legislation and government reports, and receive detailed information about the many services that I am privileged to provide for my constituents. You may also wish to visit http://thomas.loc.gov to track current and past federal legislation.

Again, thank you for sharing your thoughts with me. I appreciate hearing from you.