Every time you hit Send, someone is keeping score. Gmail, Outlook, Yahoo, they all quietly track how you behave, and that score decides whether you land in the inbox or the spam folder. It's called sender reputation. Think of it as credit, but for email.

Sender reputation is how mailbox providers decide whether your emails belong in the inbox or the spam folder. It's a score built from your past behavior. Good history gets you in. Bad history gets you filtered, throttled, or blocked outright.

Here's the first thing to know: your reputation is tracked in two separate places. There's domain reputation, tied to what you send from, say deepcurrent.io. And there's IP reputation, tied to the mail server your email leaves from. Two scores, two videos of their own, both linked below.

And it gets stranger. Gmail, Outlook, and Yahoo each keep their own score, independently. So you can have a great reputation with Gmail and a terrible one with Outlook at the exact same time. There's no single universal number.

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So what feeds the score? A handful of things. List quality, are you hitting real people or dead addresses and spam traps. Engagement, do people open and click, or ignore you. Spam complaints, every "report spam" click is a vote against you. Bounce rate, high bounces say you don't know who you're mailing. Sending consistency, jumping from a thousand a day to fifty thousand overnight looks suspicious. And authentication, having SPF, DKIM, and DMARC set up proves you're a real sender.

One number worth keeping in your head: spam complaints. As a rule of thumb, you want that under about a tenth of a percent, though every provider draws its own line. Above that, and your reputation starts taking real damage.

Here's the frustrating part. You can't see your exact score. Mailbox providers don't publish it. What you can see are the symptoms. Inbox rate dropping. Emails getting deferred. Bounce messages that literally mention reputation. And you can check outside signals, like whether you're on a blocklist. But those are proxies, not the real number.

One more shift worth knowing. Over time, domain reputation has become more important than IP reputation. Why? Because your domain is harder to fake. Most senders sit on shared IPs, where your IP score is mixed in with everyone else on that server. But your domain reputation is yours alone.

And if you're just starting out? You don't have a reputation yet at all. That's the warmup period, its own video linked below. Providers watch you closely at first, so start small, mail only your most engaged people, and prove you're trustworthy before you ramp up.

So sender reputation is your email credit score, built from how you behave, tracked per domain and per IP, and scored separately by every provider. You can't see the exact number, but you can absolutely steer it.

Want to know where your domain stands right now? You can run it through our free blocklist checker in about thirty seconds. And next up, IP reputation versus domain reputation, what the difference actually is.

What is sender reputation? It's the score Gmail, Outlook, and Yahoo assign to your sending domain and IP based on how you've behaved in the past, and it decides whether you land in the inbox or the spam folder. In this video: why it's tracked in two places (domain and IP), why every provider scores you independently, the six things that shape it, the one complaint number to watch, and why you can't see your exact score.

0:00 It's a credit score for your email

0:20 The one-line answer

0:40 Tracked in two places: domain and IP

1:05 Every provider scores you separately

1:40 What actually shapes the score

2:15 The complaint number to remember

2:35 Why you can't see your exact score

3:00 Why domain reputation is quietly winning

Concepts in this video:

IP reputation → reviewmyemails.com/emailalmanac/sender-reputation/overview-and-fundamentals/what-is-ip-reputation

Domain reputation → reviewmyemails.com/emailalmanac/sender-reputation/overview-and-fundamentals/what-is-domain-reputation

Warmup period → reviewmyemails.com/emailalmanac/sender-reputation/building-and-maintaining/how-long-does-it-take-to-build-sender-reputation

Related:

How is sender reputation calculated? → [link 002.003.005]

How can I check my sender reputation? → [link 002.003.006]

Free blocklist checker → reviewmyemails.com/tools/blocklist-checker

Full written guide → reviewmyemails.com/emailalmanac/sender-reputation/overview-and-fundamentals/what-is-sender-reputation

#email #deliverability #senderreputation