SENDER REPUTATION // DOMAIN + IP
Sender Reputation: The Score That Decides Your Placement
Mailbox providers keep a score on you, and they do not publish it. Sender reputation monitoring reconstructs that score from the signals they do expose: Postmaster data, blacklist status, placement results, and how they all trend together.
Inbox placement
54%
··%
· ·
Authentication
checking 130+ blacklists
Sample data. Seed results are estimates, not guarantees.
What is a sender reputation?
Sender reputation is the score mailbox providers keep on your domain and sending IPs, built from spam complaints, bounce rates, spam-trap hits, engagement, and authentication history. It decides more placement outcomes than content ever will. Inboxes tracks both halves: domain reputation, which follows you across ESPs, and IP reputation, which matters most on dedicated IPs. On Growth plans and above it ingests Google Postmaster Tools data, so Gmail's own domain reputation rating, user-reported spam rate, and authentication trends sit next to your placement history and 130+ blacklist checks on one timeline. Trend lines show whether a change helped weeks before your open rates do. Reputation cannot be bought or botted: warmup networks that fake opens violate Google's sender guidelines, and Inboxes will never use them.
What you get
Sender reputation, done properly
Domain and IP, tracked apart
A clean shared IP can mask a sinking domain, and vice versa. Separate tracks show which asset is earning the spam folder so you fix the right one.
Google Postmaster, ingested
On Growth and above, Gmail's own verdict on your domain (reputation rating, spam rate, auth trends) flows into the same dashboard, no separate console to remember.
Leading indicators, not lagging
Complaint spikes and blacklist hits show up days or weeks before open rates react. Alerts fire on the leading signal, while the damage is still small.
Every signal on one timeline
Placement dips, a new blacklist listing, a Postmaster reputation downgrade: correlated on one axis, so "what changed on the 14th" has an answer.
How it works
From send to fix list in four steps
Connect your senders
Add your sending domains and IPs; on Growth and above, link Google Postmaster Tools in a few clicks.
Establish the baseline
A week of monitoring plus a placement test gives you the honest starting picture.
Watch the trends
Reputation, spam rate, blacklist status, and placement move on one timeline with alerts on meaningful shifts.
Repair with the ranked list
When reputation dips, the fix list orders the causes: complaint sources, list hygiene, auth gaps, volume spikes.
The honest boundary: seed results are directional estimates and nobody can guarantee inbox placement. Inboxes finds the fixable causes, tells you exactly what to change, and monitors the result. No warmup networks, no bot opens, ever. Full detail on the methodology page.