Also known as: domain reputation, email reputation
Sender reputation is the trust score that mailbox providers (like Gmail and Outlook) assign to your sending domain and IP address, based on how recipients react to your email over time. High complaint rates, bounces, and spam-trap hits lower it; consistent engagement and clean sending raise it. A poor sender reputation sends your email straight to spam regardless of content, and it can take weeks or months to rebuild.
Mailbox providers track signals like spam complaints, bounce rates, how often recipients open and reply versus delete or mark as spam, and whether you hit spam traps. Sending to a stale or purchased list, blasting from a cold domain without warmup, or sending high volume from your primary company domain all damage reputation fast. Because reputation is tied to the domain, a careless cold campaign can poison the inbox you run your whole business from — which is why separate sending domains exist.
The defenses are the same disciplines that protect deliverability: send from dedicated domains separate from your main one, warm new domains gradually, authenticate everything, keep lists clean and verified, and honor opt-outs immediately. Reputation is easier to protect than to repair, so the right time to set up sending infrastructure properly is before your first campaign, not after you've landed in spam.
Sender reputation is the invisible asset every outbound program depends on. Once it's damaged, no amount of clever copy gets you back to the inbox — so protecting it is more important than almost any single message you'll send.
High spam-complaint and bounce rates, sending to stale or purchased lists, blasting from a cold domain without warmup, hitting spam traps, and sending high volume from your primary domain. Mailbox providers read these as spammer behavior.
It can take weeks to months, depending on how badly it was damaged — which is why protecting reputation with separate domains, warmup, and clean lists is far easier than repairing it after the fact.
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