Formally accept the job. Directly state that you agree to the terms of the position at the beginning of your email.Mention following things in your mail: Sample Reply: Thank you so much for offering me the job. The key here is to have a line ready, such as, "Thank you so much for the offer. I am so excited for this opportunity. The first thing you should put on your job acceptance letter is the date. Include it underneath the header close to the top of your letter. Just rely to the email. It's a legal concept that offers should be extended, and then accepted. If a company sends a candidate a job offer letter what is a reasonable amount of time to expect the candidate to reply?