尼日利亚客户理签证访厂问题

原文邮件内容如下： our company is in search for a reliable manufacturer/supplier in china and we he check your company profile on your alibaba website which prompt us to contact your company for business transaction. our company board of trustees he all agreed to import your products to our country but they do so, on suggestion that some selected delegates from our company??must visit your company in china for face to face business talk and to inspect your products and to make customize order of your products. the selected delegates will also discuss with your company board about the nigeria market and who/where we plan to supplier your products. for our delegates to be able to visit your company, chinese embassy here in nigeria need your government business visit invitation letter which will enable our delegates get visa. we urge your company to make inquire from your local government for a business visit invitation letter for our visiting delegates and inform us the documents required for the invitation letter asap. our company hope to cooperate with your company asap. 1.??我没有主动发送过邮件给此人，从他邮件内容猜测该公司制度应该还算完善而且也不像是小公司，但是他没有公司邮箱，其邮箱是用的雅虎的，@:rzkk_okg, 且无签名档，无公司名称电话等信息，所以判定这是个假邮件。请大侠们帮忙判定下。 2.??通常客户签证来访厂，被访公司一份邀请函盖公章就ok了，为何会要政府业务访问邀请函？这个是不是也能说明这是骗子客户呢？ 希望大侠们或者遇到类似问题的朋友们给个建议~~谢谢~~~