Learn how to write a professional job offer letter acceptance mail reply with joining date with an easy format and practical samples. Learn why you must write a job acceptance letter and how to write one with a professional touch through our tips and free 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. A job acceptance letter lets you outline the details of the job so that you are clear about your role in the company prior to your joining. Or you can apply for different jobs at the same company, and each application will count. Learn how we are responsibly meeting the world's energy needs. Internship Resources. Complete the application as best you can, and we'll follow up with you if we have questions. Learn how to apply for unemployment benefits.