What is a Honeypot in Email Security Terms?

A Honeypot is, by definition, a decoy or a trap whose purpose is to detect and identify unauthorized use in order to prevent breaches.
In Email Security, a Honeypot is a SMTP server setup to process a single domain (or multiple domains) to gather emails all day long. Let’s examine two methods used by email honeypots to lure and detect spammers: the open relay, and the spamtrap.

Read more on Email Security Blog:
http://www.emailsecuritymatters.com/site/blog/email-security/what-is-a-honeypot-in-email-security-terms/