---
title: "IP Reputation | Sales Glossary"
description: "Sending IP address reputation with email providers. Affects deliverability. Learn key concepts, industry benchmarks, and best practices."
canonical: "https://firstsales.io/sales/glossary/ip-reputation/"
---

[Home](/)/[Glossary](/sales/glossary/)/IP Reputation

I, Sales Glossary

# IP Reputation

Sending IP address reputation with email providers. Affects deliverability.

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## What is IP Reputation?

IP reputation is a score assigned to your email sending IP address by mailbox providers (Gmail, Outlook, Yahoo, corporate domains) based on your sending history and recipient behavior. A good reputation means your emails reach the inbox; a bad reputation means spam folder or blocking.

**Think of it as a credit score for email:**  
* Good history = high reputation = inbox placement
* Poor history = low reputation = spam filtering
* It takes time to build, moments to damage

## Why IP Reputation Matters

**Deliverability Impact:**  
* IP reputation is the #1 factor in email deliverability
* Poor reputation affects ALL emails from that IP
* Recovery from damaged reputation takes weeks or months
* Many mailbox providers block emails from low-reputation IPs entirely
**Business Consequences:**  
Damaged IP reputation means:  
* Emails go to spam instead of inbox
* Response rates plummet
* Lead generation campaigns fail
* Sales outreach becomes ineffective
In 2026, mailbox providers use increasingly sophisticated AI to evaluate IP reputation. Maintaining good reputation is non-negotiable for email success.

## Reputation Scoring

**Score Ranges (Typical):**  
* **90-100**: Excellent (green zone)
* **80-90**: Good
* **70-80**: Fair (room for improvement)
* **Below 70**: Poor (delivery problems)
**Key Reputation Providers:**  
* **Sender Score (Return Path)**: 0-100 scale, monitored by major ISPs
* **Cisco Talos**: Blacklist provider
* **Spamhaus**: Blacklist provider
* **Barracuda**: Reputation network
**Mailbox Provider Systems:**  
Each major provider maintains their own internal reputation scoring systems-Google Postmaster Tools, Microsoft SNDS, Yahoo Feedback Loop.

## Factors Affecting IP Reputation

**Positive Factors:**  
* Low spam complaint rates (under 0.1%)
* High engagement rates (opens, clicks, replies)
* Consistent sending volume patterns
* Low bounce rates
* Few spam trap hits
**Negative Factors:**  
* High spam complaint rates
* Low engagement (ignored emails)
* Sudden volume spikes
* High bounce rates
* Spam trap hits
* Sending to purchased lists

## Monitoring IP Reputation

**Key Tools:**  
* Google Postmaster Tools (for Gmail)
* Microsoft SNDS (for Outlook/Office 365)
* Sender Score (Return Path)
* MXToolbox (blacklist checking)
* Gmail, Outlook, Yahoo seed list testing
**What to Monitor:**  
* Reputation score changes
* Spam complaint rates
* Placement rates (inbox vs. spam)
* Blacklist status
* Volume and engagement metrics

## Best Practices

1\. **Warm Up New IPs**: Gradually increase sending volume over 2-4 weeks. Never start with full volume.

2\. **Monitor Consistently**: Check reputation weekly. Problems detected early are easier to fix.

3\. **Honor Spam Complaints**: Immediately remove anyone who complains. One complaint isn't bad; ignoring complaints kills reputation.

4\. **Maintain Consistent Volume**: Sudden spikes look suspicious. Build volume gradually over time.

5\. **Segment by Risk**: Separate your highest-risk sends (cold outreach) to different IPs than transactional emails.

## Common Mistakes

* Not monitoring reputation until deliverability crashes
* Sending from new IPs without warmup
* Ignoring spam complaints
* Sudden volume increases
* Mixing high-risk and low-risk email streams on same IP
* Sending to purchased or scraped lists

## Key Takeaways

* IP reputation is a score (0-100) determining email deliverability
* 80+ is good; below 70 causes delivery problems
* Monitor via Google Postmaster, Microsoft SNDS, Sender Score
* Warm up new IPs gradually over 2-4 weeks
* Good reputation requires consistent good sending practices

## Related Terms

[IICP (Ideal Customer Profile)Description of perfect-fit customer based on firmographic and behavioral criteria.View term](/sales/glossary/icp/)[IInbound LeadProspect who contacted you first. Higher conversion than outbound.View term](/sales/glossary/inbound-lead/)[IInbound SalesResponding to prospects who initiated contact. Pull strategy.View term](/sales/glossary/inbound-sales/)[IInbox PlacementEmails landing in primary inbox vs spam. 87% excellent, 60-70% average.View term](/sales/glossary/inbox-placement/)

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