The mailcap descriptions says:
The mailcap file is used by the metamail program.
but it is possible to remove mailcap without removing metamail. If the
above statement is true, there should be a dependency. If it is false, the
statement should be removed or clarified.
not necessarily. If the file is present, metamail will use it. Other programs
use it also.
However, metamail and other programs have built-in fallbacks if the file is not
present, so an explicit dependency is not needed.