Your resignation letter should be upbeat and positive. It should be written to your immediate supervisor, expressing warm feelings for the company, and regrets that you can no longer work there. Don't be negative or drag in greviences. At some point they will be contacted for references regarding your employment and any negatives at this point will be remembered more than the time worked there.
Sample Resignation Letter #1
[NAME OF IMMEDIATE SUPERVISOR]
Subject: Voluntary Resignation of [YOUR FULL NAME]
This will constitute my notification to you and [COMPANY NAME] of my resignation from [COMPANY NAME], effective [FINAL DAY WORKED].
Please accept my sincere gratitude to both you and [COMPANY NAME] for the opportunities extended to me during my [YEARS WORKED] career. My decision to resign was reached with great difficulty; however, I have accepted a position with another company, which will be in the best interest of my family and myself. Please understand that I am not in a position to consider an alternative offer from [COMPANY NAME], since my decision to resign is final.
Again, thank you very much for all you past courtesies. If, in the future, an opportunity would present itself, where I again may become an employee of [COMPANY NAME], I hope you would provide your support for rehire.
[YOUR SIGNATURE AND
Sample Resignation Letter #2
Dear [immediate supervisor]:
This letter is intended to serve as my notice to terminate my employment with [company name], as of [termination date]. My reasons for termination are due to a divergence of personal philosophy that are in no way related to our personal and/or professional relationship in the operations of the [locale name] area. In fact, it has been an honor and a pleasure to have had the opportunity to work with you, and I wish you success in all that you do going forward. I should also wish to extend my most sincere gratitude to the [company name] family for affording me the support and opportunities that, to this point, have led to a long and satisfying career with the company. I tender this resignation with a heavy heart, but also with a sound resolve. I wish you all the best.