Opt-in email

Opt-in email refers to a permission-based email marketing strategy where recipients explicitly consent to receive communication from a sender. This approach is often used by businesses and organizations to build and maintain a list of subscribers who are genuinely interested in their content, products, or services. There are typically two main types of opt-in email: 1. **Single Opt-In:** In this method, a user provides their email address and is immediately added to the mailing list without any further verification.