What is the correct format for a letter drop?

The correct format of a letter's epigraph:

The epigraph is the last line of the letter, signed with the name of the writer. The signature should be written at the end of the body of the right side of the empty half line. If it is written to the familiar relatives, friends, you can add their own name, such as brother, sister and so on. Write the name at the back, no need to write the last name.

If the letter is written to an organization, be sure to write the last name and first name in full. After the name, or in the lower right of the next line of the name, write the year, month and day of the letter, so that the recipient can check.

Precautions:

Letters should be written with a black felt-tip pen, or blue water pen, ballpoint pen, or fountain pen. No pencils should be used in case of blurring. Also can not write with a red pen, which will make the other party think it is a letter of extinction. The letterhead should be on special letterhead or manuscript paper.

(1) The address, words of greeting and the tone and wording of the letter should be in line with the identity of the writer.

(2) The cultural level and experience of the recipient should be taken into account so that the recipient can understand the letter.

(3) To grasp the key points, and strive to write a full, successful, short.