SEmail Deliverability Glossary

Sender Score (Validity Sender Score)

Q: What is a good Sender Score for email deliverability?

Sender Score ranges from 0–100. Scores above 90 indicate top-tier senders with excellent inbox placement across most providers. Scores 80–89 are good — you should see generally solid deliverability with no major provider blocking your mail. Scores 70–79 indicate some filtering is occurring and warrant investigation. Below 70, expect meaningful inbox placement problems. Below 60, you're likely experiencing significant blocking or spam classification. During warm-up, your Sender Score will start low or nonexistent (no history) and climb progressively as you build clean sending history.

Q: Does Google use Sender Score to determine Gmail inbox placement?

No — Google and Microsoft use their own proprietary internal reputation systems, not Sender Score. Sender Score is maintained by Validity (formerly Return Path) and reflects reputation signals from Validity's own data partnerships. It's a useful third-party indicator but doesn't directly influence Gmail or Outlook filtering decisions. Google Postmaster Tools is the only authoritative source for your Gmail-specific reputation. Sender Score is most relevant for ISPs and corporate mail systems that integrate directly with Validity's data feeds. Use it as one of several monitoring signals, not as your primary warm-up progress metric.

Q: How do I improve my Sender Score?

Sender Score improves by improving the underlying metrics it measures: reducing bounce rates (clean your list regularly, use email verification), reducing complaint rates (segment your list, personalize content, make unsubscribing easy), avoiding spam trap hits (use double opt-in, never buy lists, remove inactive addresses), maintaining consistent sending volume (avoid sudden spikes), and passing authentication checks (SPF, DKIM, DMARC). Running active warm-up with a quality network generates the engagement signals that underpin positive IP reputation, which Sender Score reflects. Improvement is typically visible over 4–8 weeks of clean sending.

A third-party IP reputation metric scored 0–100 by Validity. Scores above 80 indicate healthy delivery; below 60 signals active blocking. One signal among many.

Sender Score is a third-party email sender reputation metric maintained by Validity (formerly Return Path). It scores your sending IP address on a scale of 0–100.

Score interpretation:

Score Range	Reputation Level
90–100	Excellent — Top senders
80–89	Good — Normal inbox delivery
70–79	Fair — Some filtering expected
60–69	Poor — Significant filtering
< 60	Bad — Likely being blocked

Check your score: senderscore.org (free lookup by IP address)

Note: Sender Score is one input among many. Google and Microsoft use their own internal reputation systems that are not directly correlated to Sender Score. Use it as one signal, not the definitive measure.

Frequently Asked Questions

What is a good Sender Score for email deliverability?

Sender Score ranges from 0–100. Scores above 90 indicate top-tier senders with excellent inbox placement across most providers. Scores 80–89 are good — you should see generally solid deliverability with no major provider blocking your mail. Scores 70–79 indicate some filtering is occurring and warrant investigation. Below 70, expect meaningful inbox placement problems. Below 60, you're likely experiencing significant blocking or spam classification. During warm-up, your Sender Score will start low or nonexistent (no history) and climb progressively as you build clean sending history.

Does Google use Sender Score to determine Gmail inbox placement?

No — Google and Microsoft use their own proprietary internal reputation systems, not Sender Score. Sender Score is maintained by Validity (formerly Return Path) and reflects reputation signals from Validity's own data partnerships. It's a useful third-party indicator but doesn't directly influence Gmail or Outlook filtering decisions. Google Postmaster Tools is the only authoritative source for your Gmail-specific reputation. Sender Score is most relevant for ISPs and corporate mail systems that integrate directly with Validity's data feeds. Use it as one of several monitoring signals, not as your primary warm-up progress metric.

How do I improve my Sender Score?

Sender Score improves by improving the underlying metrics it measures: reducing bounce rates (clean your list regularly, use email verification), reducing complaint rates (segment your list, personalize content, make unsubscribing easy), avoiding spam trap hits (use double opt-in, never buy lists, remove inactive addresses), maintaining consistent sending volume (avoid sudden spikes), and passing authentication checks (SPF, DKIM, DMARC). Running active warm-up with a quality network generates the engagement signals that underpin positive IP reputation, which Sender Score reflects. Improvement is typically visible over 4–8 weeks of clean sending.

Related Terms

IP Reputation

The trust score ISPs assign to a specific sending IP based on bounce rates, complaint rates, spam trap hits, and sending pattern consistency.

Domain Reputation

The permanent trust score ISPs assign to your sending domain based on historical behavior. Unlike IP reputation, a damaged domain reputation can take months to recover.

Gmail Postmaster Tools

Google's free service that shows domain reputation, spam rate, authentication pass rates, and delivery errors for mail sent to Gmail. The most important warm-up monitoring tool.

Microsoft SNDS (Smart Network Data Services)

Microsoft's free service showing sending data and filter verdicts for Outlook.com and Hotmail delivery — the Microsoft equivalent of Google Postmaster Tools.

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