What Is Sender Reputation?
Sender reputation is the trust score mailbox providers assign to a sender based on their IP address and domain sending history. It is shaped by engagement, complaint rates, spam-trap hits, and authentication, and directly determines whether emails reach the inbox or spam.
Reputation is tracked at both the IP level and the domain level, and each provider maintains its own private score. There is no single global number — Gmail, Outlook, and Yahoo each judge you independently based on how their users interact with your mail.
Positive signals raise reputation: consistent volume, high open and reply rates, low bounce rates, and near-zero complaints. Negative signals damage it fast: sending to spam traps, high hard-bounce rates from stale lists, sudden volume spikes, and recipients hitting "report spam."
A damaged reputation is recoverable but slow. Recovery usually means pausing aggressive sending, warming the domain back up with engaged traffic, cleaning the list, and rebuilding a steady positive engagement pattern over several weeks.
MailPilot continuously builds positive engagement through warmup and surfaces a reputation and outreach-ready status, plus recovery tooling to rehabilitate domains that have taken a hit.
Build and repair sender reputation →