Written by Venkat Nookala · Last updated 2026-07-22
It checks where mail actually arrives by reading owned seed mailboxes directly — a sample you control — rather than inferring delivery from send logs or tracking pixels. It separates Inbox from Spam, measuring placement without manufacturing engagement — an honest signal that sender-side metrics and manufactured-engagement warmup pools cannot provide.
Most "deliverability" numbers are inferred from the sender's side: accepted-by-server counts, or open rates from tracking pixels. Neither tells you the one thing that matters — which folder the recipient sees. Receiver-side placement measurement answers that directly. You maintain a set of owned seed mailboxes, send your campaign (or a representative copy) to them, then read those inboxes and classify each result: Inbox or Spam. The output is an observed placement rate, not a guess. Two honesty constraints make this trustworthy rather than theatrical: the panel must be owned and disclosed in scope — it is a sample, not a census of the whole internet — and it must not be confused with manufactured-engagement warmup, which manipulates reputation instead of measuring it. Done right, placement measurement is the feedback loop that makes everything else — authentication fixes, warmup pace, content changes — verifiable. Humerly can provide this as part of the control plane: we measure inbox placement on seed mailboxes we own, as a sample, and we do not measure where your live production mail lands — alongside pre-send audit and continuous monitoring.