Sender Reputation
The trust score inbox providers assign your sending domain and IP, built from complaint rates, bounces, engagement, and volume patterns.
Free · no signup · last reviewed August 29, 2026
The definition
The trust score inbox providers assign your sending domain and IP, built from complaint rates, bounces, engagement, and volume patterns.
Why it matters to an owner
Earned in months, spent in an afternoon — one blast to a stale list can undo a year of careful sending. Protect it like the asset it is.
Keep going
DeliverabilityWhether your email actually reaches inboxes rather than spam folders or silent rejection. …Spam Complaint RateThe share of recipients clicking 'report spam.' Gmail's bulk-sender threshold: stay under …Email WarmupGradually building a new inbox's sending reputation by starting with tiny volumes and real…
This is the work. Want it done?
Everything here is free to use yourself — that’s the point. If you’d rather a senior marketer just handle it, in your accounts and your name: 20-minute call, no pitch deck.