dear sir or madam meaning in English

不确定具体的收信人
写信给某一公司
尊敬的先生或女士

“ dear sir or madam , my name is pamela dubberly
（亲爱的先生/女士：我叫芭米拉?杜波雷。
Dear sir or madam welcome to our website if you want to kown more about our products or need our help please write down your requirements in the following form and send to us . we ll attend to them as quickly as possible
如果您需要了解我们的产品或得到我们的服务，请您在以下表中填入您的要求，发送给我们，您可以在最短的时间内得到我们的服务！