- is_deeply([ $mime->header('Archived-At') ], [ "<${u}a\@b/>" ],
- 'Archived-At: set');
- is_deeply([ $mime->header('List-Archive') ], [ "<$u>" ],
- 'List-Archive: set');
- is_deeply([ $mime->header('List-Post') ], [ '<mailto:a@example.com>' ],
- 'List-Post: set');