How To Write A Letter For Everything They've Done . For your trust, cordiality and unique support; Decide if you want to send the note through email or post. How To Write A Cover Letter How Of Everything from www.howzzdat.com In more formal correspondence, like when you’re writing to your boss, a hiring manager, or your professor, “dear [name]” is a better choice. I say a big thank you. It relays the sincerity in which you hope the message is received.