---
title: "Sender Score | Sales Glossary"
description: "0-100 rating of IP/domain reputation. 90+ excellent. Learn key concepts, industry benchmarks, and best practices."
canonical: "https://firstsales.io/sales/glossary/sender-score/"
---

[Home](/)/[Glossary](/sales/glossary/)/Sender Score

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# Sender Score

0-100 rating of IP/domain reputation. 90+ excellent.

[Back to glossary](/sales/glossary/)

## What is Sender Score?

Sender Score is a 0-100 rating that evaluates the reputation of your email sending IP address or domain, similar to a credit score for email senders. Developed by Return Path (now Validity), it's one of the most widely recognized email reputation metrics.

**Score Interpretation:**

| Score Range | Reputation | Deliverability Impact          |
| ----------- | ---------- | ------------------------------ |
| 90-100      | Excellent  | Inbox placement rarely blocked |
| 80-89       | Good       | Most emails reach inbox        |
| 70-79       | Fair       | Some filtering occurs          |
| Below 70    | Poor       | Major deliverability issues    |

A sender score below 70 means your emails are likely being filtered to spam folders or blocked entirely.

---

## Why Sender Score Matters

**Inbox Placement:**  
Email providers use sender reputation as a primary filtering signal. Low scores directly cause emails to bypass the inbox.

**Sending Limits:**  
Some providers throttle or block senders with poor scores. You may be limited to sending a few emails per day regardless of your infrastructure.

**Domain Warming:**  
New domains start with no reputation. Building to a score of 90+ takes 2-4 weeks of proper warm-up and consistent sending practices.

**Competitive Advantage:**  
High sender scores ensure your outreach actually reaches prospects while competitors with poor scores waste money on emails that never get seen.

---

## How Sender Score Is Calculated

Sender Score algorithms consider multiple factors:

**Engagement Metrics (40% weight):**  
* Open rates
* Click-through rates
* Reply rates
* Delete-without-reading rates
* "This is not spam" complaints
**Complaint Metrics (30% weight):**  
* Spam button clicks
* Abuse reports
* ISP feedback loop submissions
**Infrastructure (20% weight):**  
* SPF, DKIM, DMARC authentication
* Sending infrastructure quality
* IP/domain relationship
**Volume and Consistency (10% weight):**  
* Sending patterns
* Volume spikes
* List hygiene practices

---

## Improving Your Sender Score

### 1\. Proper Authentication

**Required Setup:**  

```text
SPF records: Authorize sending IPs
 DKIM signatures: Prove message authenticity
 DMARC policy: Tell servers how to handle failures
```

### 2\. List Hygiene

**Regular Cleaning:**  
* Remove hard bounces immediately
* Process unsubscribe requests instantly
* Remove inactive subscribers (no opens in 6+ months)
* Never purchase or rent email lists

### 3\. Engagement Focus

**Best Practices:**  
* Send content recipients actually want
* Segment by engagement level
* Re-engagement campaigns before removing inactive subscribers
* Monitor and minimize complaints

### 4\. Consistent Sending Patterns

**Recommended Approach:**  
* Gradually increase volume during warm-up
* Maintain consistent daily/weekly sending
* Avoid sudden volume spikes
* Send during business hours in recipient timezones

### 5\. Monitor and Respond

**Key Metrics to Track:**  
* Complaint rate (should be <0.1%)
* Bounce rate (should be <2%)
* Unsubscribe rate (should be <0.5%)
* Spam trap hits (should be zero)

---

## Checking Your Sender Score

**Tools:**  
* [SenderScore.org](https://senderscore.org) \- Free lookup by IP address
* [MXToolbox](https://mxtoolbox.com) \- Blacklist and reputation checking
* \[Google Postmaster Tools\] - For Gmail senders only
**Paid Platforms:**  
* Validity - Comprehensive deliverability suite
* 250ok - Email analytics and monitoring
* NeverBounce - List cleaning with reputation insights

---

## Common Sender Score Issues

### Volume Spikes

**Problem:** Sudden increase in sending volume triggers spam filters.

**Solution:** Gradual ramp-up over 2-4 weeks during warm-up.

### Spam Trap Hits

**Problem:** Emailing spam traps destroys reputation instantly.

**Solution:** Never buy lists, regularly clean your database, use confirmed opt-in.

### High Complaint Rates

**Problem:** Recipients marking messages as spam.

**Solution:** Better targeting, clearer opt-in process, easier unsubscribe.

### Poor Authentication

**Problem:** Missing SPF/DKIM/DMARC records.

**Solution:** Complete authentication setup immediately.

---

## Recovery from Low Sender Scores

**If Your Score Drops Below 70:**

1\. **Immediate Action:**  
 \- Stop all email marketing immediately  
 \- Identify the cause (complaints, bounces, spam traps)  
 \- Remove problematic addresses

2\. **Infrastructure Review:**  
 \- Verify SPF/DKIM/DMARC setup  
 \- Check for compromised accounts  
 \- Audit all sending sources

3\. **Rebuild Strategy:**  
 \- Start fresh with new sending domain if severely damaged  
 \- Re-warm gradually with engaged subscribers only  
 \- Monitor scores daily during recovery period

4\. **Prevent Recurrence:**  
 \- Implement double opt-in  
 \- Regular list cleaning  
 \- Engagement-based segmentation

---

## Key Takeaways

* Sender Score is 0-100 reputation rating for email senders
* 90+ is excellent; below 70 causes major deliverability problems
* Based on engagement, complaints, infrastructure, and sending patterns
* Improve through: authentication, list hygiene, engagement focus
* Check scores at SenderScore.org and other free tools
* Common issues: volume spikes, spam traps, high complaints
* Recovery requires stopping sends, fixing causes, and re-warming
* Monitor score regularly as part of email marketing operations

## Related Terms

[SSAL (Sales Accepted Lead)Lead accepted by sales for qualification. Bridge between MQL and SQL.View term](/sales/glossary/sal/)[SSales CadenceStructured sequence of touchpoints over time.View term](/sales/glossary/sales-cadence/)[SSales ChampionInternal advocate promoting your solution. Key to enterprise deals.View term](/sales/glossary/sales-champion/)[SSales CycleTime from first contact to closed deal. Varies by deal size.View term](/sales/glossary/sales-cycle/)

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