The article deals with the problematic aspect of electronic communication between businesses and customesr. In this kind of communication the main tool which is used is email – electronic mail. The main problem connected with electronic email is the possibility of misuse by a third person. Because of this it’s very important to understand ways to prevent email abuse. Spam is not only about time losses, but also about risks of malware infection or phishing messages. This topic is very important for small businesses and single agriculture subjects in rural areas. The influence of information technologies rises every year, despite the digital divide between rural areas and large cities/ industrial areas.