What Is a Good Sender Score? Ranges & Fixes (2026)
A good sender score is above 80. Scores of 90+ correlate with complaint rates below 1% and typically strong inbox placement. Between 70 and 79, you're in warning territory. Drop below 70 and you'll start seeing throttling and spam folder placement across multiple ISPs.
Here's what most "aim for 80+" advice misses, though: Sender Score alone doesn't determine whether your emails reach the inbox. Globally, only 83.5% of legitimate emails hit the inbox - 6.7% land in spam, and 9.8% vanish entirely. Your score is a signal, not a verdict.
Sender Score Ranges Explained
The raw number matters less than what it correlates with. Here's what Mailjet's analysis of Return Path data shows:
| Score Range | Complaint Rate | Unknown Users | Spam Traps | What It Means |
|---|---|---|---|---|
| 90-100 | <1% | ~1% | 0.36% | Strong - maintain course |
| 80-89 | Low | Low-moderate | Low | Solid - monitor and maintain |
| 70-79 | Moderate | Moderate | Moderate | Fix now or expect throttling |
| 0-10 | 7.4% | 7% | 7.53% | Severe, immediate action needed |
Scores between 11 and 69 fall on a gradient between these extremes. The lower you go, the worse each metric gets. The gap between 90+ and 0-10 is dramatic: bottom-tier senders hit spam traps at roughly 21x the rate of top-tier senders, and the correlation between complaint rates and deliverability problems stays remarkably consistent across the full range.
Why a High Score Doesn't Guarantee Delivery
You can score 90+ and still land in spam on Outlook. We've seen it happen - a sender with correct SPF, DKIM, and DMARC, everything green, delivers fine to Gmail but gets routed to spam on Yahoo, Hotmail, and AOL. Content "spam word" checkers flag generic terms like "Unsubscribe" and "for you," but removing those words changes nothing. It's almost always reputation or authentication, not content.
Sender Score is compiled from non-personal data from 60M+ inboxes plus partner data across ISPs, spam filtering, and security companies. It doesn't include the granular internal signals Gmail, Outlook, or Yahoo use for their own placement decisions. When Sender Score and Google Postmaster Tools disagree, the ISP-specific tool wins every time.
Let's be honest: most senders obsess over their number when they should be spending that energy inside Google Postmaster Tools. A composite score is useful for benchmarking. It's useless for diagnosing why Outlook is junking your Tuesday newsletter.
Your sender score drops every time you hit an invalid address or spam trap. Prospeo's 5-step verification catches both before you send - with 98% email accuracy and spam-trap removal built in. At $0.01 per email, fixing your list costs less than one junked campaign.
Stop guessing which emails are safe to send.
Metrics That Drive Your Score
In our experience, complaint rate is the single fastest lever. These are the factors that actually move the needle:
Spam complaint rate is king. Klaviyo flags anything above 0.01% as high, which panics senders who get 3-4 complaints on a 3,000-person send. The practical ceiling for healthy deliverability is 0.02% sustained - anything above that and you're on borrowed time.
Bounce rate should stay under 3%. Higher than that signals list hygiene problems to every ISP watching. Spam trap hits are disproportionately destructive - even a handful tanks your reputation because they come from stale lists and purchased data, which ISPs treat as a bright red flag.
Volume consistency matters more than people think. Sudden spikes trigger ISP scrutiny, so ramp gradually. And check your blocklist presence on Spamhaus, Barracuda, and SURBL regularly - one listing can override an otherwise clean score.
If you fix nothing else, fix your complaint rate.
How to Check Your Reputation
You need three tools, all free:
- SenderScore.org - Quick IP health check and benchmarking
- Google Postmaster Tools - Gmail's source of truth for domain reputation, spam rate, and authentication
- Microsoft SNDS - The only way to see how Microsoft views your sending IP
If you only check one, make it Google Postmaster Tools. Gmail is where most B2B recipients live.
How to Fix a Bad Score
Let's say you sent to 10,000 contacts, 8% bounced, and your score dropped 15 points overnight. Here's the repair playbook.
Fix Authentication First
Confirm SPF, DKIM, and DMARC are correctly configured. Since early 2024, Gmail and Yahoo require DMARC for bulk senders sending 5,000+ emails per day, and by 2026 non-compliant messages are rejected at the SMTP level. This isn't optional anymore.
Clean Your List
Bad data is the upstream cause of bounces, and bounces destroy reputation. Every invalid address and spam trap on your list is actively working against you. We've watched teams go from 8% bounce rates to under 3% just by running verification before each campaign - Prospeo's 5-step process catches spam traps, honeypots, and catch-all domains at 98% accuracy, and the free tier gives you 75 verifications per month to spot-check before a send.
Suppress Disengaged Contacts
Follow HubSpot's staged repair approach: for two weeks, send only to contacts who clicked in the last 14 days. Once you hit 20-25% open rates, expand to openers from the past 4 weeks, then 6 weeks. This gradual re-engagement signals to ISPs that real humans want your email.
Ramp Volume Gradually
Start at 25-30% of normal send size and increase weekly. If you're on a new IP, you won't have a score yet - warm up by sending small volumes to your most engaged contacts first. Skip this step and you'll undo all the cleanup work you just did.
Bounce rates above 3% wreck your reputation. Teams using Prospeo's verified data cut bounce rates from 35%+ to under 4% - and kept them there. Every email goes through catch-all handling, honeypot filtering, and spam-trap removal on a 7-day refresh cycle.
Clean data is the fastest fix for a bad sender score.
FAQ
Is a Sender Score of 70 bad?
It's not catastrophic, but it's a clear warning that deliverability is degrading. Check your complaint rate and bounce rate first, then cross-reference with Google Postmaster Tools to see which providers are actually downgrading you.
What score do I need for reliable inbox placement?
Aim for 80+, but treat it as a benchmark rather than a target. A score of 85 with clean authentication and low complaints will outperform a 95 on a domain with DMARC misconfigured. Good email reputation follows good practices - not the other way around.
Can I have a high Sender Score and still land in spam?
Yes, and it happens regularly. Sender Score doesn't reflect any single ISP's internal view of your domain. Cross-check with Google Postmaster Tools and Microsoft SNDS to find the real culprit.
How does bad contact data affect my score?
Invalid emails cause hard bounces, and stale lists contain spam traps - both destroy sender reputation fast. Verifying contacts before sending keeps bounce rates under 3% and avoids trap hits entirely. Tools like Prospeo and NeverBounce handle this, though we've found Prospeo's spam-trap and honeypot filtering catches issues other verifiers miss.