Hi @patonbrevo ,
Thanks for posting on this community!
Actually, here are the differences between marketing emails and transactional emails:
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marketing emails: basically, they are campaigns: you send one email to N users, in one time
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transactional emails: you send one email to one person.
More details on this article: https://help.brevo.com/hc/en-us/articles/360021196220-What-is-the-difference-between-Marketing-emails-Transactional-emails-Automation-
So, if the emails you send on day 2/4/6 are sent through an automation, they are considered by Brevo as transactional emails.
If you were to send them manually from a campaign, they would be considered as marketing emails.
Back to your use case, if you want to consider people who unsubscribe from these emails as being « marketing only » unbsubscribed, from my current knowledge you have no other choices than sending them through a campaign.