The marketing tool of emailing provides three unrivalled advantages. Firstly, no other medium reaches addressees so uncomplicatedly, leads them so rapidly from advertising to buying and makes them acquainted with a company and its products. Secondly, emails are most cost efficient. Thirdly, emails may be generated electronically directly from a database of customers. However, there are many aspects one has to take into account with regard to emails addressed to clients. Otherwise one may lose customers instead of winning new ones and could even get in financial trouble due to infringement on competition laws. How to avoid these mistakes and how to be successful in marketing is described in a special article by Sabine Philipp on MittelstandsWiki.