/mā-liŋ list/
n. (often shortened in context to 'list') 1. An email address that is an alias (or macro, though that word is never used in this connection) for many other email addresses. Some mailing lists are simple 'reflectors', redirecting mail sent to them to the list of recipients. Others are filtered by humans or programs of varying degrees of sophistication; lists filtered by humans are said to be 'moderated'.
2. The people who receive your email when you send it to such an address.