Newsletters are news letters sent regularly - weekly or monthly - by e-mail to subscribers or to a closed user group. They can be company information sent to employees, information newsletters in which new products, business news or information about new techniques, processes or concepts are published like in a newspaper.
HypertextMarkup Language( HTML) or Portable Document Format( PDF) are often used as file formats for e-mail newsletters. E-mail newsletters may only be sent to interested parties, customers or employees if they have given their consent to receive the newsletter by means of a double opt-in.
In addition to the normal newsletter, there is also the enhanced newsletter. In this concept, newsletters are created jointly by several companies and emailed to interested parties. Such an enhanced newsletter contains information from different companies, which, if possible, have a similar information offer or where the products complement each other.