It didn't cost me anything to keep her on the mailing list.

把她保留在我的邮件列表上，并不会花费我任何东西。

youdao

At the same time, the postal area will be collected by the cost of mailing a full refund of the sender.

同时，邮政方面将把所收的邮寄费用全额退还寄件人。

youdao

What is your address. I could mail it out TOP PRIORITY mailing. It saves me $80 and does not cost you any less money.

请告知你方邮寄地址，我方需要寄快件给你，这样可以节省我方80美元而你方不需任何费用。

youdao

If the reform passes, it could head off next year's planned 5.4% postal rate increase the one that will push the cost of mailing a single letter to 39 cents from 37 cents.

FORBES

They may never disappear as long as people are buying and the cost per acquisition is lower than the cost of printing and mailing.

CNN: Why dirty up my hands with newsprint?