Your cover letter shows employers how well you express yourself with qualificatin and experience and make yourself as asset to the company. It can also demonstrate that you are savvy in the ways of marketing yourself and selling your best qualifications. A good cover letter can entice the recipient to review your resume. A bad cover letter, on the other hand, can nip your chances in the bud. Here are 10 mistakes that contribute to bad cover letters. To ensure that your cover letter is effective, avoid these mistakes: