Using ~/sent is a strange default setting used when there is no
configuration file. Let us override it.
'-x',
'-e', 'set charset="utf-8"',
'-e', 'set send_charset="us-ascii:iso-8859-2:utf-8"',
'-x',
'-e', 'set charset="utf-8"',
'-e', 'set send_charset="us-ascii:iso-8859-2:utf-8"',
'-s', $headers->{'Subject'},
);
delete $headers->{'Subject'};
'-s', $headers->{'Subject'},
);
delete $headers->{'Subject'};