But your drip sequence is marketing isn’t it? Then in my world it should have an unsubscribe link in it (should you have added an unsubscribe link to it)
Also, a drip sequence is in response to a customer action (a signup or a purchase) and it is triggered per individual, not mass-emailing like campaigns, so it should not go into campaigns.
The issue I see is that for emails in the drip sequence, even if they do not have an unsubscribe link in them they still are « unsubscribable ». They do get picked up by email inbox cleaning tools as sadly, the header now informs these are mailing-list type emails.
So, in my drip sequence, the first email does not have an unsubscribe link, it is a response to a signup action and provides information on how to use an application (I also use a separate email address for this). Then, the next emails in the drip sequence are marketing and in those I add an unsubscribe link (and send with a second email address).
Because the first email without unsubscribe links has its header wrongly defined, I get users unsubscribing to the first email. Then since unsubscribe is per email address, they end up receiving the drip sequence (since it is sent by another email address) and I’d rather they didn’t since they have actually tried to unsubscribe from my marketing emails.
The issue here in my case is with the header of emails with no unsubscribe links. I’m opening a new thread on this specific issue.
On your issues with not sending campaign to user that unsubscribed, I also had this issue: the Brevo team suggested this workaround How to filter out recipients in campaigns that have unsubscribed to transactional emails?