They just stopped delivering my email campaign after half of the emails were sent because they thought that the unsubscribe rate was to high (> 1%). Thats totally ridiculous. Its also depending on the topic of the campaign...They marked half of my contacts deliberately and for no reason as "refused". They didn't allow me to resume sending to them again. I wasted a lot of time because of that. Their support consists in just copy pasting the same email again and again. I can only strongly advise against using Brevo. Never again for sure.
