Spam and internet security information Anti Spam Spam, or electronic 'junk mail', has increased so sharply in recent years that it is threatening the viability of email. Spam messages are often fraudulent, offensive or annoying, and they often carry viruses. Many countries are now introducing legislation to ban or regulate the sending of spam. The ACA is responsible for enforcing Australia's anti-spam law, the Spam Act 2003. This section of our website contains information for ...