I have received a formal job offer and have been emailed a pdf formal offer letter to sign and return. Everything's in order, the letter has been revised to reflect negotiated terms, and I'm prepared to accept.
Every form I find for accepting says I should begin "Dear Mr/Ms _______"
The job offer letter opens with "Dear [first name]"
I'm thinking I should begin my reply with "Dear [first name]" as well, and keep it more formal, but a friend said that it would be better to say "Hi [first name]" as all previous emails (well, all 2 of them) to this person already began "Hi." The email in which this person attached the formal offer letter also began "Hi [first name]."
I suppose this detail is not terribly important in the big picture, but I don't want to come off sounding either too casual or too stuffy.
At the moment, I think "dear" is the safer way to go, but wanted to hear others' thoughts. I already checked out this related question: How do you send a job acceptance email?
Thanks for your help!