Learn how to write a professional job offer letter acceptance mail reply with joining date with an easy format and practical samples. I am writing to confirm my acceptance of your employment offer on April 20 and to tell you how delighted I am to be joining XYZ Corporation in Chicago.Writing a job acceptance letter is a sign of professionalism. Check out these job acceptance letter samples to write a perfect acceptance letter Learn why you must write a job acceptance letter and how to write one with a professional touch through our tips and free samples. Take a look at the samples below to see a variety of formatting options.