return $ct{'text/plain'} if exists $ct{'text/plain'};
return $ct{'text/html'} if exists $ct{'text/html'};
return $parts[0] if $which =~ /text/;
return $parts[1] if $which =~ /html/;
should be
my $ct = $which eq 'html' ? 'text/html' : 'text/plain';
return $ct{$ct} if exists $ct{$ct};
# Fall back to plain text or HTML
return $ct{'text/plain'} if exists $ct{'text/plain'};
return $ct{'text/html'} if exists $ct{'text/html'};
# Fall back to whatever's first
return $parts[0];
By the way,
$ct{$_->content_type} = $_ for @parts;
should be changed to
$ct{$_->content_type} ||= $_ for @parts;
to get the *first* part with the right content type, not the last.
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