Yes, you are right. It seems like there is a global issue right now. I spoke with a friend who works at a big agency, and he told me their Outlook deliverability is still good. I talked more with him, and he explained something important. A lot of sequencers in the market have been using the same warmup pools for years. So when you start warming up through them, their IPs and warmup networks may already be flagged in Outlook spam filters. Because of that, your emails start going to spam, and even your domain can get affected. This is why Outlook deliverability can drop to almost zero when using these public sequencer warmup pools. Many agencies are now using their own closed Outlook-based warmup pools. They warm domains by sending emails into the Outlook network, and if any emails land in spam, they manually or automatically move them to the primary inbox for around 30 days. Doing this consistently improves deliverability. Sending 20–30 emails daily to Outlook mail servers and getting them placed in the primary inbox helps build trust with Outlook. So the core thing is this: whether you use Outlook accounts or Google accounts, without proper Outlook-based warmup, your emails can still go to spam. Outlook has become very restrictive now, and using sequencer warmup pools can actually hurt your deliverability instead of improving it.