Hi @Jakub,

For these scenarios, we typically build a Segment Triggered Flow, and create the required transactional message. Then we contact Klaviyo Support to review the message, approve it as a Transactional message, and then backpopulate the Flow to start sending. 

Segments can include unsuppressed people, but until a message is approve for transactional messages, they are automatically prevented from sending to suppressed people.

Some more documentations for others about Transactional messages in Klaviyo that might be helpful:

• How to use flows to send transactional emails

I’m not sure if you can get Campaigns approved for Transactional Messages, but I imagine someone else here might be able to chime in if they have done that?

Hi @retention 

Thanks for the answer this is exactly what I did and this works. Klaviyo support mark you flow as transactional and you can backpoulate you desired audience to trigger the flow.