Opt-in (or Subscribe):
Opt-In is when a user actively agrees to receive messages. To opt-in or subscribe to an e-mail list is to choose to receive e-mail messages by supplying your e-mail address to a particular company, website or individual thereby giving them permission to e-mail you. The subscriber is usually requested to give personal information such as interests or requested for futher interaction.
Opt-out (or Unsubscribe):
Opt-Out is when the user chooses to no receive messages. Spamming standards require all mailing list messages to carry a link for the recipient to un-subscribe or opt-out from further messages.
Faced with multiple options and constant innovation always makes you realize that the loyalty of users is easier Logar through the campaign email marketing because of the many options to improve incentives and improve the relevance of their strategies .