Learn how to write a professional job offer letter acceptance mail reply with joining date with an easy format and practical samples. Mention following things in your mail: Sample Reply: Thank you so much for offering me the job.You can write an acceptance email in several different ways. We have formulated a sample email for the reference of our readers. Thank you for your offer letter. I would be happy to accept your offer. Learn how to write a professional job offer acceptance email. 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. 1. Decline the offer in WRITING. Accepting an offer means that you are considering their job offer.