The first thing I want to say about cover letter format is when it comes to cover letters one size most certainly does not fit all. Although you can and should follow a format with your cover letter you should individually tailor each cover letter towards the job that you are applying for.
1. Introduction _ The introductory paragraph forms the first essential part of a good cover letter format. This opening statement, if used as an application, must clearly explain your purpose for writing the employer. It must explain the reason why you want to apply for the available position. You may also need to include how you came to know of the available post, be it referred or through the classified ads in a newspaper or online. Point out to the recruiter that your competencies meet their requirements. If the intention of your cover letter is to inquire about available positions, then you need to let them know what roles you want to perform.