Case Study: How Domain Warm-up Timelines Collapsed and Then Rebounded After the Jan 4, 2026 Shift

https://varimail.com/articles/why-most-teams-ignore-email-deliverability-until-its-too-late/

How a 200-Employee SaaS Team Watchlisted by Major Mailboxes Overnight In late 2025 our company, a SaaS platform with 200 employees and $18 million ARR, launched a dedicated domain for transactional and marketing email