# Do I need to trust spam-score checkers?

**NO**—mostly

> A 10/10 on mail-tester doesn't mean the inbox—score checkers and seed tests can't see the thing that actually decides placement: your reputation and how your recipients engage.

Paste your email into a checker, get a score out of ten, chase the score to perfection, still land in spam. The tools aren't lying to you, exactly—they're answering a much smaller question than the one you're asking.

## What a score checker can actually see

Static, per-message facts: whether SPF/DKIM/DMARC validate, whether your HTML parses, whether your domain or links sit on a public blocklist, whether a legacy content filter dislikes your words. Seed tests go one step further—sending to a panel of test inboxes and reporting where the message landed *for those inboxes*.

## What it cannot see

- **Your reputation.** [Domain reputation](https://doineed.email/domain-reputation) is the dominant input to real filtering decisions, and it's invisible to a tool that just receives one message. A pristine email from a burned domain goes to spam; a mediocre one from a trusted domain doesn't.
- **Your recipients.** Modern filtering is personalized—Gmail weighs whether *this* recipient engages with you. A seed inbox that has never opened your mail is not a stand-in for a subscriber who reads you weekly.
- **Your patterns.** Volume history, consistency, complaint trajectory—the longitudinal signals providers actually grade—don't exist for a single test message.

That's why the score converges on false confidence: the checkable things are the table stakes, and the unmeasurable things are the game.

## What they're still good for

A pre-send smoke test. A checker will instantly catch a broken DKIM record, a missing unsubscribe header, a blocklisted link domain, HTML that renders as soup—mechanical failures worth catching before 50,000 sends. Use it like a linter: failures are real, a perfect score is not a promise.

## Where to look instead

Real placement data comes from real mail: [bounce and complaint rates](https://doineed.email/bounce-and-complaint-rates) from your ESP, and [Gmail Postmaster Tools](https://doineed.email/gmail-postmaster-tools) for reputation as Gmail computes it. If those are healthy and a checker still tuts at you, believe your metrics.

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- Canonical: https://doineed.email/spam-checkers
- Learn more: https://resend.com/blog/why-your-emails-are-going-to-spam
- All questions: https://doineed.email/llms.txt

An opinionated answer from the [Resend](https://resend.com) team.