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An electronic mailing list (sometimes written as elist or e-list) is a special usage of e-mail that allows for widespread distribution of information to many Internet users. It is similar to a traditional mailing list — a list of names and addresses — as might be kept by an organization for sending publications to its members or customers, but typically refers to four things: a list of e-mail addresses, the people ("subscribers") receiving mail at those addresses, the publications (e-mail messages) sent to those addresses, and a reflector, which is a single e-mail address that, when designated as the recipient of a message, will send a copy of that message to all of the subscribers. Electronic mailing lists are usually fully or partially automated through the use of special mailing list software and a reflector address that are set up on a server capable of receiving e-mail. Incoming messages sent to the reflector address are processed by the software, and, depending on their content, are acted upon internally (in the case of messages containing commands directed at the software itself) or are distributed to all e-mail addresses subscribed to the mailing list. Depending on the software, additional addresses may be set up for the purpose of sending commands. Many electronic mailing list servers have a special email address in which subscribers (or those that want to be subscribers) can send commands to the server to perform such tasks as subscribing and unsubscribing, temporarily halting the sending of messages to them, or changing available preferences. The common format for sending these commands is to send an email that contains simply the command followed by the name of the electronic mailing list the command pertains to. Examples: subscribe anylist or subscribe anylist John Doe. Some list servers also allow people to subscribe, unsubscribe, change preferences, etc. via a website. Electronic mailing list servers can be set to forward messages to subscribers of a particular mailing list either individually as they are received by the list server or in digest form in which all messages received on a particular day by the list server are combined into one email that is sent once per day to subscribers. Some mailing lists allow individual subscribers to decide how they prefer to receive messages from the list server (individual or digest). Another type of electronic mailing list is a discussion list, in which any subscriber may post. On a discussion list, a subscriber uses the mailing list to send messages to all the other subscribers, who may answer in similar fashion. Thus, actual discussion and information exchanges can happen. Mailing lists of this type are usually topic-oriented (for example, politics, scientific discussion, joke contests), and the topic can range from extremely narrow to "whatever you think could interest us". In this they are similar to Usenet newsgroups, and share the same aversion to off-topic messages. The term discussion group encompasses both these types of lists and newsgroups. Free web-based services offering an easy way to run and maintain such lists were popular in the late 1990s, but many of these were taken over or went bust, so that the only popular provider is now Yahoo! Groups. This is used by a wide range of groups, including organizations who might at first glance be considered 'rivals' to Yahoo!. MSN Groups appears to be pushing hard to catch up to Yahoo!. Innercircle.cc is designed to email a personal group or inner circle of friends, family members, coworkers, etc. using a single email address - it has an easy to use Web interface to create and manage multiple personal groups such friends, family, soccer team, tennis buddies or a group working on a project. Freelists.org is a technology-related, web-based service using all-free software, though it may be more difficult for some users to set up. The new version of Google Groups includes free mailing list services as well as access to Usenet. Jiglu adds wiki and feed aggregation to the traditional group model, and ties it together with an "auto-tagging" function using natural language processing techniques. A mailing list archive is a collection of past messages from one or more electronic mailing lists. Such archives often include searching and indexing functionality. Many archives are directly associated with the mailing list, but some organizations like Gmane collect archives from multiple mailing lists hosted at different organizations - thus, one message sent to one popular mailing list can end up in many different archives. Gmane had archives of over 9000 mailing lists as of 16 January 2007. Some popular free software programs for collecting mailing list archives are Hypermail and MHonArc.