電郵伺服器會根據電郵內容, 比較所設定的垃圾郵件關鍵字以判定電郵是否垃圾郵件. 所以, 在進行電郵推廣時, 你應小心用字, 避免使用以下的字詞. 不過你要留意不同的電郵伺服器都有自己的一套規則去判定垃圾郵件. 但以下的字詞也是一個好好的參考.
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