E-mail nuisance is a term used to describe unwanted or unsolicited emails, commonly referred to as SPAM. These emails are usually sent in bulk and can contain malicious content such as viruses, phishing scams, or other malicious software. They can also be used to advertise products or services, or to spread false information. E-mail nuisance can be a major annoyance for users, as they can clog up inboxes and take up valuable storage space.