Thank-You Letter
A thank-you letter should be sent to an employer immediately after an interview. Make sure you thank the employer for taking the time to interview you and reinforce your interest in the employer and in the position. Also, include some key point that was mentioned during the interview. If you forgot to mention something important about yourself at the interview, you can mention it in the thank-you letter.

Application Status Check Letter
If an appropriate amount of time has passed after you have interviewed with an employer, you may send a letter to the employer inquiring about the status of your application. Reiterate your interest in the position and in the organization, remind the employer of your qualifications and recap the history of your personal contact with the employer. Be sure to thank the employer for his/her consideration.

Acceptance Letter
If an employer offers you a position and you accept it, send a letter of acceptance expressing your appreciation for the opportunity to join the organization. Confirm your date of hire. Also, if you received an offer letter from the employer, you may briefly confirm the terms of employment.

Rejection Letter
If you are not planning on accepting an offer of employment you should send the employer a letter letting them know that you are declining their offer. Express your appreciation for the offer, and above all, don't burn any bridges!