开发的客户发来的邮件，奇怪我哪里来的他们的联系方式

我还不是像大家那样的厉害角色，有隔一个星期左右的样子（有时候是10天）给客户发开发信。不是群发，我从来不做这样的事情。今天从未谋面的客户来了个邮件，给大家看一下（真实姓名略去）：

Dear Mr. W,

first of all, I don´t know where you got our email addresses from.
I don´t think that it is very nice to write emails to anyone you don´t know and to keep on pushing those persons with additional emails.
Especially if those persons do not give any reaction to your initial email – which obviously means that there´s no interest from our side.
So I would like you to stop that and to avoid those emails in the future until you tell me where you have those contacts from.
Thank you in advance!


这个相信大家都常碰到，问题是---我得到这样的回复，是不是说明的我开发信太烂？我英文是自学的，有点不好意思晒上我的上一封开发信和我看这个邮件后回复的。