Difference between trigger and system emails

Both trigger and system emails belong to the category of Transactional emails, but have some differences:

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Trigger emails

➖ are automatic emails that are sent to the user in response to some event (trigger) associated with this user. For example, a message that a user's profile has been viewed by another user, or a message about the expiration of a promotion. Trigger emails help to maintain constant communication with the user.

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System emails

➖ are automatic emails that are sent to the user in response to his action. For example, an email with instructions on how to recover a password or a message about a successful payment on the platform. The puspose of the system emails is to inform the user.

The user is able to unsubscribe from trigger emails, but not from the system emails.