In the modern day, many messages marketers created are been ignored by consumers. In order to reach the targeted consumers, marketers are required to modify the messages they sent. One of the effective way is using E-mail marketing. Because of the low cost advertising expenditure is needed, E-mail marketing is one of the most popular direct methods of online marketing. However, the use of e-mail marketing is sometimes controversial.

To avoid filters, marketers need to know what keyword would be considered as SPAM in the system.

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