Formally accept the job. Directly state that you agree to the terms of the position at the beginning of your email.An exploding offer is when a company gives you a teeny tiny window to make a decision of whether or not to take a job offer. Generally it's 24 hours or less. Mention following things in your mail: Sample Reply: Thank you so much for offering me the job. If not, accept the offer. You're overthinking it. Just write back to the email stating that you accept the job offer and look forward to starting. The short answer is yes, you can decline the offer. I suspect that the offer letter says that when you become employed, you would be an employee at will.