Click here for a quick guide on writing a stellar offer acceptance letter so you can make a positive first impression at your new job! Learn how to write a professional job offer letter acceptance mail reply with joining date with an easy format and practical samples.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. I extend my gratitude to you for offering me the position of {Title} in {Company's name}. Thank you for providing me with this opportunity. 1. Use a proper salutation. When writing an acceptance letter for a job, you want to leave a positive impression on your new employer. In response to your job offer letter, I am delighted to accept the position of Social Media Manager with Fever Dream Cosmetics.