A mail address that accepts e-mail messages and then sends them on to a pre-defined list of other e-mail addresses. Such systems are a convenient way to distribute messages to a group.
a program that distributes information or files to a subscriber of a mailing list, Usenet group, or an IRC channel
A program that distributes files or information in response to requests sent via email. Many Listservs have mail reflectors. You can request documents of a reflector by sending message with the subject "SEND document name" or a similar command. Mail reflectors are also being used to provide FTP-like services for users with limited Internet access.