1. When you are conducting a job search, an effective thank-you letter after an interview can leave a positive impression with an employer. This, in turn, will help to distinguish you from other candidates.

2. You should send the letter within 48 hours following the interview.

3. Always address a thank-you letter to a specific individual, not just the general title \"Director of Personnel.\" Be sure name is spelled correctly.

4. Make sure your thank-you letter is business-like in appearance. It should be printed on the same paper stock as your resume. Always have someone proofread your letter before sending it.

5. Write each thank-you letter separately, even if you follow a similar form for each letter. The letter should highlight what was discussed in your interview and reiterate your qualifications and continuing interest.

6. Once you receive and accept a job offer, send your new employer a thank-you letter. This is an effective way to get a good start in forming a positive relationship with your new employer.

7. Thank-you letters in response to telephone conversations and informational interviews should be short. Restate the major points of the conversation and express your appreciation for assistance.

8. If you withdraw from consideration for a position or turn down an offer, send a polite and positive thank-you letter which leaves the door open for future consideration.

9. In response to a rejection, follow a similar format. Express your gratitude for being considered, as well as your continuing interest in working for the company.

10. If you terminate employment for any reason, send a thank-you letter to your former employer. Be positive--this letter can \"clear the air,\" if necessary, and generate positive references.

Reference: High Impact Resumes and Letters by Ronald Krannich and William J. Banis.