Best of the inbox: the warm-up traps

Best of the inbox: the warm-up traps
This week's picks all expose one failure mode — scaling a new domain before mailbox providers trust it. Why each made the cut:

🚀 Deliverability
— The 50-a-day myth, debunked — worth it because it shows volume isn't the signal; engagement velocity is. A fresh IP sending to dead seeds warms nothing.
— Postmaster Tools first-week reads — picked for the screenshots: what a healthy domain reputation graph actually looks like vs. a stalled one.

🧪 Tests
— Seed-then-real cohort breakdown — earned its spot by proving that warming on engaged openers (not Glockapps seeds) is what moves the needle.

📥 Swipe
— The re-warm template after a blocklist hit — included because re-warming is different from warming, and most guides skip it.

The through-line: don't graduate volume until opens, not days, say so.
Saved you ~2 hours of reading mediocre warm-up threads.