申请的学校要求邮寄hard copy of 推荐信和成绩单 directly by people providing them.

申请的学校要求邮寄hard copy of 推荐信和成绩单 directly by people providing them.

原句：
 Official English-language transcripts sent directly by the institutions you have attended
-baidu 1point3acresThe two reference letters mentioned above, sent directly to us by the people providing them

是不是就是得三封分开寄+ 成绩单 一共得邮寄4份呢？
可不可以把信封都封口，然后放在快递公司的文件袋里面一起寄过去呢？

（现在需要邮件的学校太少了， 但是就是必须得邮寄啊， 求指导）