A key element in any e-mail marketing strategy is to obtain customers' approvals before sending them any e-mail that includes a marketing or promotional message.

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Obtaining customers' approvals (also known as opt-in) is a crucial element in e-mail marketing. It helps to build a targeted and engaged audience that is more likely to respond positively to your messages. Additionally, sending unsolicited emails can result in spam complaints and damage to your sender reputation.

A Key Element in Any E-Mail Marketing Strategy Is to Obtain