@Md Al Mamun Thanks man! What I am most concerned about is that I had fresh domains/inboxes, 1 month old, with inbox placements around 50% (even one of the domains was never used for cold emailing, despite having been for 2 weeks+ warming up). It also seems to be unlikely that this was from inbox provider nor the email sequencer warm up pool. I wonder, how can you determine if its a deliverability issue without tracking open rate? And also, a reply rate around 0.7 already signals deliverability issues?