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Deliverability, decoded
Practical guides and research from the team building the world's best inbox warmup tool.
Why cold emails fail in 2026 (and how to fix it)
Spam filter machine learning models have become dramatically more sophisticated in the past 18 months. Sending cold outreach from an unwarmed domain no longer just hurts open rates — it can permanently damage your domain reputation within 72 hours.
Read more →Gmail's new spam filters: what you need to know
Google's February 2026 update tightened bulk sender rules and introduced per-message ML scoring across all Gmail accounts — including Workspace. Here's a breakdown of what changed and exactly what you need to do to stay in the inbox.
Read more →The complete guide to email warmup for sales teams
Most warmup guides tell you to "just send a few emails a day and wait." That advice is dangerously incomplete. This is the end-to-end playbook we use with Warmy customers — from day one ramp curves to maintaining reputation at scale.
Read more →More posts coming soon
We publish weekly on deliverability, cold email strategy, and product updates. Follow @warmyio to get notified.