Metamail is an implementation of Multi-purpose Internet Mail Extensions (MIME), a proposed standard for multimedia electronic mail on the Internet. . Metamail is configurable and extensible via the "mailcap" mechanism described in an informational RFC that is a companion to the MIME document. Metamail can be used to turn virtually any mail reader program into a multimedia mail reader. For information about how to change mail readers so that they can use Metamail, please read the file `/usr/share/doc/metamail/mailers.txt.gz'.