What is the definition of spamming in email security?

Spamming in email security refers specifically to the act of sending unsolicited bulk emails. This practice involves dispatching large volumes of messages to multiple recipients who have not opted to receive them, often for the purposes of advertising, phishing, or spreading malware. Because spam emails clutter inboxes and can be harmful to users, effective email security measures, such as filtering systems, are crucial in identifying and blocking these unwanted messages.

The other options do not accurately define spamming. Sending encrypted messages is a practice aimed at protecting the content of emails rather than contributing to spam. Efficient email storage management refers to practices that help optimize email storage capacity and accessibility, which is unrelated to the concept of spam. Filtering legitimate messages involves processes that distinguish valid communications from unwanted ones, but it does not encapsulate what spamming means in the context of email security.