Dear _______:

This letter will confirm my resignation from ________, effective immediately with my last day being _________.

I want to thank you for the courtesy and consideration shown to me while I was part of your organization.

Please be assured that my decision was based solely on my personal and professional needs and in no way reflects on you or the company.

This difficult and final decision was reached only after thorough consideration. Please know that I am not open to discussing a counter offer, as I have already accepted the position.

I wish continued success to you and to the team here at ___________. Certainly during this transitional period, under your direction, I will do everything possible to ensure an easy and profitable transfer of territorial responsibilities to my successor.