以下是可以用来说服客户付样品邮资的句子：
1)It is our company rule.We will appreciate if you pay postage for the samples.
这是我司的规定。如贵方能付样品邮资，我方将不胜感激！
2)We believe this will do favor to develop the business between us.We are doing in this way with most of our customers.We sincerely hope it will be also workable to you.
我方相信这将促进双方的业务。我方与大多数的客户都是这样做的。我方真诚的期望这对贵方也是可行的。
3)Besides,it is also a way to show your sincerity of doing business with us.
另外，这也是体现贵方与我方合作的诚意。
4)We promise we will definitely return the postage to you when we first cooperation.
我方承诺，首次合作时，我方一定会把邮资返还给贵方！
5)So,you may just choose some interesting items(products) and tell us your company's courier account and No.
因此贵方只要告诉我方感兴趣的项目（产品）以及贵司的快递帐号。
6)We also accept T/T in advance If you don't have any courier account.The following is our USD account information:
如果贵方没有任何快递帐号，我方也接受贵方的电汇。以下是我方的美圆帐户信息：
7)We will consult relevant courier company here and inform you how much postage you should pay to our USD account.
我方将咨询相关快递公司，然后通知贵方要付多少到我方的美圆帐户上。
8)We regret that any inconvenience brought to you and thanks very much for your cooperation.
对贵方带来的不便之处，我方深表歉意。同时也感谢贵方的合作！