Yeah Microsoft is a whole different animal than Google for cold 😅 it barely looks at your content — it's almost all domain/IP reputation, and once SmartScreen flags you it kinda sticks. That's probably why it hit you a couple weeks in as volume ramped up, even though Google stayed happy. Couple things I haven't seen mentioned yet that help a lot: 1. Turn off open/click tracking (and any custom tracking domain) on your Microsoft sends. Those tracking pixels + link domains are one of the biggest MS spam triggers — even a 1-line email gets nuked if there's a no-reputation tracking domain attached. Kill tracking, retest, and placement usually jumps. 2. Since your DNS is clean and it's still 100% spam, those 2 domains are probably already flagged on Microsoft's side, and that's slow to undo. khuzaima's idea is the real move tbh — provider-match: hit your Outlook/Hotmail contacts from MS-based infra and keep Google→Google. Google→Microsoft cold is just rough right now. Also worth tightening the list — MS gets aggressive past ~0.3% complaints, so cleaner targeting helps the rep recover. Hope that helps 🙌

@John Rami nice, that rules tracking out 👍 while those MS inboxes warm up, two things that'll make the wait actually pay off: 1. Sign up for Microsoft SNDS (Smart Network Data Services) with your sending domains/IPs — it's free and it shows you how Microsoft actually sees your reputation, so you're not flying blind when you start sending again. 2. Warm the new MS inboxes slower than you did the Google ones — MS punishes fast ramps way harder. Keep them on warmup ~3 weeks, start real sends single-digits/day, and keep your most engaged Outlook contacts first in line (early engagement is what builds the rep). Your old Google domains should still be fine for the Gmail side of your list, so you're not starting from zero 💪