E-mail spam defines unsolicited emails that are sent to numerous receivers simultaneously.
The contents and purpose of these emails vary, ranging from advertising messages to malware attacks.
Anti-spam software can detect the sender IP of a message and can prevent it from being received, thus protecting the user from accessing infected emails or annoying advertisements.
There are also some spam blockers that offer users the possibility to send reports regarding their spam, in order to increase the protection level of their application.