SMTP is a communication protocol used for transferring email to electronic mail servers.
SendinBlue SMTP is the transactional email service of SendinBlue.
A transactional email is sent to certify a transaction or action. Actions such as these can trigger a transactional email: email for an account creation, order confirmation emails, recovery password emails, and all your non-promotional emails.
Just like your regular campaigns, SendinBlue SMTP also allows you to view the history of sent emails, openings, clicks, hard bounces and many other information.