Attachments: Many e-mail programs allow you to attach files such as documents and worksheets. If a message has an attachment, the file name appears on the attachment line.
The letter or message comes next. It is typically short and to the point. Finally, the signature line provides additional information about the sender. Typically, this information includes the sender's name, address, and telephone number.
Following the domain name system discussed earlier, e-mail addresses have two basic parts. The first part is the user's name and the second part is the domain name, which includes the domain code.
You can also use e-mail to communicate with people you do not know but with whom you wish to share ideas and interests. You can participate in discussions and debates that range from general topics like current events and movies to specialized forums like computer troubleshooting and Star Trek.
Mailing lists allow members of a mailing list to communicate by sending messages to a list address. Each message is then copied and sent via e-mail to every member of the mailing list. To participate in a mailing list, you must first subscribe by sending an e-mail request to the mailing list subscription address. Once you are a member of a list, you can expect to receive e-mail from other on the list. You may find the number of messages to be overwhelming. If you want to cancel a mailing list, send an e-mail request to "unsubscribe" to the subscription address.
Newsgroups, unlike mailing lists, use a special network of computers called the Usenet. Each of these computers maintains the newsgroups listing. There are over 10,000 different newsgroups organized into major topic areas that are further subdivided into subtopics. Contributions to a particular newsgroup are sent to one of the computers on the Usenet. This computer saves the messages on its system and periodically shares all its recent messages with the other computers on the Usenet. Unlike mailing lists, a copy of each message is not sent to each member of a list. Rather, interested individuals check contributions to a particular newsgroup, reading only those of interest. There are thousands of newsgroups covering a wide variety of topic areas.
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