Your mailbox is likely to be flooded with waves of emails falling into several categories: Email you want from people you are directly communicating with, email you don't want ha (SPAM) from people you don't communicate with, and a kind of nebulous third wave consisting of emails you want to receive but not high priority.
The last bay is the province of Bacn. Bacn is a term coordinated by participants at PodCamp Pittsburgh 2, a new media conference, in 2007 to refer to email messages that you specifically subscribed to ̵1; such as reseller coupons, service announcements, social networking alerts, etc. – but that you may not want to read immediately. The group's announcement includes a slogan for the new term: Bacn is email you want – but not right now.
Picture of cyclonebill / Wikimedia.