Your contacts must be able to unsubscribe/opt out of receiving marketing emails. You can set theDocumentation Index
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email_is_transactional field when sending an email to specify its type. If a contact has unsubscribed, and the email_is_transactional attribute is set to false, the contact will not receive the email.
Open enables opting out contacts in two ways:
- An API for generating links that your contacts can click to unsubscribe
- An API for unsubscribing contacts from within your apps