To whom it may concern
Please consider, August 31th is my final day of employment.
Dear friends / customers
I would like to inform you that after eight successful years in mutual agreement I am leaving my position as sales manager at XXX company to pursue another opportunity with my own business. I truly appreciate the opportunity to work with you and I hope that we will meet in future. Even though I will miss my colleagues and the company, I am looking forward to this new challenge and to starting a new phase of my career. I wish you much success.
Please keep in touch, I can be reached at my personal email address (email@example.com) or at mobile + 48 xxx xxx xxx
Thanks again for everything.