Opt-Out Policy – Requires a "negative" action from the customer. Potential customers must "uncheck" the company's services they wish to subscribe to, as well as all information they provide that may be used by the company.
Double Opt-in Policy – Requires a double "positive" action from a potential customer. In other words, in the first step, the potential customer can self-select the services of the company they wish to subscribe to whatsapp number list They also authorize the company to use the information they provide. In the second step, they will receive an email with a link and must click on it, confirming their willingness to receive information from the company.
It's clear that sending emails is simple, easy, and inexpensive, but the crux of the matter isn't the actual work of sending emails. The challenge lies in the prior work involved in obtaining data (database quality) and obtaining permission (presumably, legal analysis) to send these email shots.
If this work isn't done beforehand, all the low cost and ease of sending email marketing becomes inglorious and ineffective, because we don't have the main thing: permission to contact our prospects/customers.