Reference information about the author;

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the name of the company or the name of the competent person who is the author of the letter;
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author's signature;
sometimes – the company seal.
Documents for internal company data exchange are called "internal
In the field of management activities, business correspondence performs many functions.

The information function is that business correspondence helps to iran email list preserve important information.
Communicative function. With the help of business correspondence, employees maintain contact with each other, with management and other companies.
Social function. Solves various social problems, primarily by responding to information needs.
Legal function. Serves as evidence in lawsuits.
Management function . Business correspondence sometimes initiates decisions of managers and helps to implement them.
Cultural function. Ethnic and national-cultural aspects of documents can be conveyed through business correspondence.
Historical function. Can convey information from history to society.
Despite the ability of business correspondence to perform many functions, the main ones still remain informational and communicative.
The process of legal regulation does not provide for the use of business messages. Normative legal acts are issued as rules, regulations, instructions, decrees, orders, orders, but not in the form of letters and messages.