Opt-out

In the messaging world, it is mostly used by marketing departments as a way of offering customers the ability to unsubscribe from the messages he receives.

The practice differs around the world and in some countries the opt-out function is a mandatory part of message text by law. It usually comes at the end of a message, as instructions on how to opt-out. Chat applications like Viber have an opt-out option for A2P messages at the top of the chat group.

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