Brevo Sandbox Mode Issue

[starinje]

Hello, we are trying to leverage the Brevo Sandbox mode outlined here to keep emails from sending. Using Sandbox mode to send an email

I can confirm that we are setting the headers "headers": {"X-Sib-Sandbox":"drop"}, however the live emails are still being sent. Is there another factor that I am missing?

[Mauricio]

Hi @starinje , can you confirm you are passing the headers as a payload object and not actual http headers?