一般简短的开发信三段就够了，
第一段，我能给你带来什么好处，你为何要看这封开发信？
第二段，你为什么要相信我？
第三段，接下来咱们怎么进展？
要让文字背后是思想，所以这三个问题，你自己一定得要想清楚，然后用最简洁有力的语言把它说出来，这样你的开发信就有力度了。否则，没有内涵，再美的语言都是浮华不实的句子堆砌。
Re: Saving your purchasing cost for quality XXXX
Dear John,
When you next consider your arrangements for XXX products, I would welcome the opportunity to understand your requirements and situation.
Our customer include (XXX,XXX), who have found our XXX is superior in quality while saving them % cost from working with us.
I will send you more detailed information regarding this product in another email. When you receive it, can you please email me your requirement for this product?
Best regards,
这个标题的切入点很重要，针对不同类型的客户，这个关注点是不同的。比如小企业主，你可以和他说，帮他赚钱，但对于一个职业采购经理，他对这个兴趣就不大，他的职责是帮公司省钱，省了钱就有功劳有奖金，所以你说可以帮你省钱，他会更关注。
零售商，批发商，网店等各类不同的客户，他们如何运营他们的生意，业务员最好能有所了解。比如，一个大超市，他们的货架对于他们来说是最值钱的东西，他要求货品不仅要价格便宜，而且还要有很大的市场。一个产品上架需要一年甚至更多时间，你如果用一个临时促销活动的低价去吸引他，肯定不灵光的。
Dear XXX,
Good morning!
I am very glad to know you from your professional website, you are the leading company in Japan for machine vision system. I also notice that you pay much attention to lower your cost for quality machine vision system. That is where I can be of help.
May I introduce myself to you? I am XXX, from XXXX. We have been in machine vision system industry for more than XXX years. I am confident that we are capable to meet your quality standard, while cutting your cost by at least 10%. Please be sure, we are also very capable to custom produce with your drawings.
To enable you to evaluate our quality, may I invite you to visit our factory?(或者：may I send you a sample?)
Best regards,
Honored to see you here, Hope you are doing great!!
I'm very keen to set up our semitrailer manufacturing service with your company as we have our own dedicated team and workshop serving the entire China and oversea. Allow me to work on your various trailers in order to experience our services.
I am sure it won't be disappointing.
We provide supporting and processing services for global vehicle manufacture.
Customized your trailer by your principles
OEM or ODM services in CKD/SKD status are available.
We can supply metalworking service including plasma cutting, lasing, bending, welding, polishing, painting and so on.
Our main trailers including Cargo transport, Low bed trailer, Modular Trailers (Hydraulic multi axle trailer), SPMT (Self-propelled Modular Transporters),trailer for wind power industry, flatbed and skeletal semitrailers, etc
With rich processing experience and practical expertise, Solid, Durable, and Powerful quality products can be supplied. We know how to make better bodies for semi-trailers, dumpers, and trucks
We can discuss in detail as I get your reply.
I would appreciate that you give to me a chance to cooperation
Feel free to ask for quotes, as we're willing to be your one-stop solution for all your semitrailer needs
