There must be a title at the beginning of the text. This is also a very important detail, which not only shows respect for the recipient, but also lets the recipient know that this is an email addressed to himself, not a mistake; After addressing, you can write a short cover letter in the body, which is what you want to say. This is one of the advantages of mail delivery.

The example is as follows: "Dear HR,

Hello: I fully agree with your company's business philosophy of "everything depends on user value" and values of "integrity+enterprising+cooperation+innovation". I am eager to join your company, strive for the mission of "improving the quality of human life through Internet services", and see my growth steps in the process of becoming the most respected Internet enterprise. The position I applied for this time is XXXX (briefly write down the reasons why I am suitable for this position). The following is my resume, please check it. "