/usr/share/perl5/Email/FolderType/MH.pm is in libemail-foldertype-perl 0.813-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | package Email::FolderType::MH;
use strict;
=head1 NAME
Email::FolderType::MH - class to help Email::FolderType recognise MH mail directories
=cut
sub match { @_ || return 0; $_[0] =~ m{/\.$} }
1;
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