The metamail program reads a "
metamail-2.7: description + notes
mailcap" file to determine how to display non-text at the local site. Every mail-reading interface needs to call metamail whenever non-text mail is being viewed, unless the mail is of a type that is already understood by the mail-reading program. Metamail consults the mailcap file(s) to determine what program to use to show the message to the user.
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