企业间的信函往来种类:
1)航空(By Air-Mail);
2)挂号(Registered,或Reg;Regd.);
3)快递邮件(Express);
4)包裹邮件(Parcel Post);
5)印刷品(Printed Matter);
6)样品(Sample);
7)商业文件(Commercial Papers);
8)密函(Confidentia1);
9)亲启,私人信(Private);
10)赠品(With Compliments);
11)如无法投递,请退某处(1fimdelivered,please re-turn to......);
12)保护退还邮费(Return Postage(Guaranteed);
13)留存邮局(Post Restitute/Care Postmaster);
14)无商品价值样品(Sample(s) of no commercial Value)。