shotgun mailing campaign

It does mean random mailing campaign. Can't help with the translation.

Thanks anyway. I remember seeing something in Chinese that looks like a word-for-word translation, but cannot be sure.

http://www.marketing-schools.org/types-of-marketing/shotgun-marketing.html



Here's a Google translation of that. Maybe it will help you.

[报价]什么是猎枪营销？猎枪营销策略试图提高人们对一个产品的人一个大的，非特定的组，而不是广告为特定人群。 Ŧ
[Bàojià] shénme shì lièqiāng yíngxiāo? Lièqiāng yíngxiāo cèlüè shìtú tígāo rénmen duì yīgè chǎnpǐn de rén yīgè dà de, fēi tèdìng de zǔ, ér bùshì guǎnggào wèi tèdìng rénqún.

术语引用的文字猎枪，这引发了大范围的大量的小颗粒，而不是一个单一的子弹。
Shùyǔ yǐnyòng de wénzì lièqiāng, zhè yǐnfāle dà fànwéi de dàliàng de xiǎo kēlì, ér bùshì yīgè dānyī de zǐdàn.

就像一个实际的猎枪的颗粒，这种营销策略是一个单一的爆炸，影响大的人口统计数据。
Jiù xiàng yīgè shíjì de lièqiāng de kēlì, zhè zhǒng yíngxiāo cèlüè shì yīgè dānyī de bàozhà, yǐngxiǎng dà de rénkǒu tǒngjì shùjù.