什么样的开发信客户看了就会打开？

一直觉得自己的开发信写的不咋滴，之前也看过很多人分享的开发信。自己稍加改过后，发给客户，依旧是很多客户不回复，还有的直接被退回，在此附上我一直在用的开发信模板，希望诸位大神指导一下。

Dear Sir,


This is Vanessa from XXXXXXX Factory ,Exporting all human and Synthetic hair products with good quality and low price in shandong.


If you are interested in our products, please contact me at any time, we can talk more details.




Best wishes





Vanessa