Comprehensive guide on how to send a rental application denial letter. The letter will inform them why their application was denied politely.Applications will be pre-screened for completeness and applicant and property eligibility. A landlord may ask you to fill out a rental application. If you don't meet the criteria for rent relief, you will receive a written denial that you can appeal. Your polite rental application denial letter should clearly state the applicant's name as given on their original submission. Online Rental Application Directions. All applicants will receive an approval or denial email once all applications have been reviewed and processed. The first step to starting an appeal is to fill out a. Notice to Appeal form.