How to attract buyers by business email?

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I am a sales to export road safety equipments to worldwide, I met the problem was many of my sending emails looked like disappear forever, received a little response from buyer. Whether I didn't write a good business email? or our goods can't attract buyers? or my emails were blocked by the emails spam system?As a international sales, business email is an important contact with buyers.Furthermore,the first promotion business email plays vital roles to get in touch with your potential buyers. Mylotters, could you please advise me how to write a successful business email and draw buyer's attention? Thank you in advance.