Describe that last time you received an important letter or email who the letter or email was from when you received it what it was about and explain how it made you feel

Well, I received a number of emails on my professional account because I'm working as a math teacher in school. And most of the time, our organization teams send us emails. But here, I want to describe one such email, which was very important for me. That email is none other than my joining letter [...]