The Mutt E-Mail Client : Reference : Configuration variables : use_mailcap
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6.3.152. use_mailcap

Type: quad-option
Default: ask

If set to ``yes'', always try to use a mailcap entry to display a MIME part that Mutt can't understand what to do with. If ``ask'', prompt as to whether to display as text or to use a mailcap entry. If ``no'', always view unsupported MIME types as text.

Note: For compatibility with metamail, Mutt will also look at the environment variable MM_NOASK. Setting this to 1 is equivalent to setting use_mailcap to ``yes''. Otherwise, the value of MM_NOASK is interpreted as a comma-separated list of type names (without white space) for which the corresponding mailcap entries will be used to display MIME parts without prompting the user for confirmation.


The Mutt E-Mail Client : Reference : Configuration variables : use_mailcap
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Next: pgp_verify_sig