Dear Tom,
How is everything going?
This is Li Ke from China. The reasons why I believe is that I am writing this email to share a thing about I had found a job of teacher with you.
Fist and foremost, It is obvious that I fancy being a teacher most. Because teacher can give students a better future, teacher can pass the knowledge down students, so that students can give a better job in the future. What is more, it is a job that can give your confidence, which is because most people respect teacher and students admire their teacher. Last but not least, teacher has many kinds of holiday,so that can make you with family and friends enjoy this holiday.
In a word, I like being a teacher very much.
I hope you and your family good health and happiness. I am looking forward to hearing from you soon.
Thank you for your email. I hope this email finds you well.
In terms of your writing, there are a few errors that need to be corrected. For example, when you say "the reasons why I believe is that," the correct phrasing would be "the reason why I am writing this email is because." Additionally, you should have capitalized the "f" in "First and foremost."
Your ideas about being a teacher are well-expressed, although it would have been more effective if you had given an example from your personal experience or something specific to emphasize your point. Furthermore, you could have elaborated on why you think being a teacher is important or how it makes a difference in society.
In terms of structure, your email could have been clearer if you had separated your points into paragraphs. This would have made it easier to read and follow your thoughts.
Overall, I would give your email a score of 7 out of 10. While you conveyed your ideas well, there were some grammatical mistakes and the structure could have been better.