This file is indexed.

/usr/share/idzebra-2.0/tab/mail.flt is in idzebra-2.0-common 2.0.59-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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BEGIN				{ begin record wais }
/^From:/	BODY	/$/	{ data -element name $1 }
/^Subject:/	BODY	/$/	{ data -element title $1 }
/^Date:/	BODY	/$/	{ data -element date $1 }
/^$/		BODY	/^From /	{
						data -text -element Body $1
				  		unread 2
                                  		end record
                                	}