Full Overview of Microsoft Exchange Online Protection
Spam is unsolicited messages or other content that is sent to a high number of recipients in bulk via email. Many years ago, spam messages were nothing more than unwanted advertising content. Today, spam can pose a threat because it has become more than just an annoying piece of advertising. Spam senders use sophisticated techniques when sending email spam. They can attach spyware, malware or ransomware to messages, and use XSS injection or just links to viruses.