This guide will help landlords navigate the rental application denial process and provide a free rental application denial letter template. First, clearly state the reason for the appeal of the property's decision and restate their reason for denying your rental application.One option is to write a cover letter that explains why you have a lower credit score as well as what you are actively doing to raise it. The best time to send an appeal letter is within a week from receiving the denial letter. If I understand your email correctly, you cancelled your application, therefore you have no further obligation to submit information.