# What is an IP Reputation? > Learn about IP reputation, ensuring email deliverability with SPF, DKIM, DMARC authentication protocols. IP reputation is a score or rating assigned to an IP address by email providers, like Microsoft or Google, based on its email-sending behavior. It reflects how trustworthy the IP is perceived to be, directly affecting whether emails sent from it reach inboxes or are blocked as [spam](https://palisade.email/learning/understanding-spam-emails). Think of it as a reputation badge for your server’s address, signaling reliability or risk. IP reputation is influenced by factors such as email volume, bounce rates, spam complaints, and authentication via protocols like [SPF (Sender Policy Framework)](https://palisade.email/learning/what-is-spf), [DKIM (DomainKeys Identified Mail)](https://palisade.email/learning/what-is-dkim), and [DMARC (Domain-based Message Authentication, Reporting, and Conformance)](https://palisade.email/learning/what-is-dmarc). For example, an IP sending consistent, authenticated emails earns trust, while one linked to [phishing](https://palisade.email/learning/what-is-phishing) campaigns loses credibility. ## How Does an IP Reputation Work? IP reputation is calculated by email providers through ongoing analysis of an IP address’s email activity. Here’s how it operates: ![Five-step flow showing how an email travels from sender to recipient and how the receiving server scores the sending IP.](/images/figures/what-is-an-ip-reputation-fig1.webp) *The journey of an email, and where the sending IP's reputation gets judged.* When you send an email from your [email client (MUA)](https://palisade.email/learning/what-is-an-mua), it travels via your [mail transfer agent (MTA)](https://palisade.email/learning/what-is-an-mta) using [SMTP (Simple Mail Transfer Protocol)](https://palisade.email/learning/what-is-smtp) to the recipient’s server, identified by [MX records](https://palisade.email/learning/what-is-an-mx-record). The recipient’s server evaluates the sending IP’s reputation based on several metrics: - Authentication: Protocols like [SPF](https://palisade.email/learning/what-is-spf), [DKIM](https://palisade.email/learning/what-is-dkim), and [DMARC](https://palisade.email/learning/what-is-dmarc), stored in [TXT records](https://palisade.email/learning/what-is-a-txt-record), verify email legitimacy. Passing checks enhances reputation. - Engagement: High open rates and low spam complaints signal trusted emails, while frequent reports hurt the IP’s score. - Bounces: High bounce rates from invalid addresses indicate poor list hygiene, lowering reputation. - Sending Behavior: Sudden volume spikes or irregular patterns can raise suspicion, impacting deliverability. For example, a 2025 campaign achieved 90% inbox placement using a reputable IP with strong DMARC compliance, compared to 25% for an IP flagged for [spam](https://palisade.email/learning/understanding-spam-emails). ## Why IP Reputation Matters IP reputation is a linchpin of [email deliverability](/resources-post/email-deliverability-is-not-set-and-forget), with significant impacts: - Inbox Delivery: A high reputation ensures emails reach inboxes, not spam folders, driving engagement and conversions. - Brand Credibility: Trusted IPs, paired with [BIMI (Brand Indicators for Message Identification)](https://palisade.email/learning/what-is-bimi) logos, build recipient confidence, reducing [phishing](https://palisade.email/learning/what-is-phishing) risks. - Business Outcomes: Poor reputation causes email blocks, costing revenue. A company lost $75,000 in 2025 when campaign emails were diverted to spam. - Security Defense: Strong reputation supports authentication, deterring [spoofing](https://palisade.email/learning/what-is-spoofing) and protecting your domain from fraud. - Provider Trust: Consistent reputation management maintains trust with email providers, ensuring long-term deliverability. A solid IP reputation is your gateway to reliable, secure email communication. ## Things to Keep in Mind Maintaining a strong IP reputation requires proactive strategies. Here are key considerations: ![Checklist of five practices for maintaining a strong IP reputation, from authentication to DMARC report monitoring.](/images/figures/what-is-an-ip-reputation-fig2.webp) *Five proactive habits that protect your sending reputation.* - Authentication Protocols: Deploy [SPF](https://palisade.email/learning/what-is-spf), [DKIM](https://palisade.email/learning/what-is-dkim), and [DMARC](https://palisade.email/learning/what-is-dmarc) to authenticate emails, stored in [TXT records](https://palisade.email/learning/what-is-a-txt-record). Monitor [email headers](https://palisade.email/learning/what-is-a-header) to verify authentication and address issues. - List Hygiene: Clean email lists regularly, removing invalid or inactive addresses to reduce bounces and spam complaints, strengthening reputation. - Content Practices: Send permission-based emails with clear subject lines, avoiding spammy phrases to boost engagement and minimize flags. - Sending Consistency: Maintain steady email volumes to avoid suspicion. Use [MTA-STS](https://palisade.email/learning/what-is-mta-sts) for secure transmission to enhance trust. - Reputation Monitoring: Review [RUA](https://palisade.email/learning/what-is-a-rua) [DMARC reports](/resources-post/how-to-understand-dmarc-reports) and [DNS](https://palisade.email/learning/what-is-a-dns) settings to track reputation metrics and optimize performance. These steps safeguard your IP reputation and ensure email success. ## Wrapping Up IP reputation is the unseen driver of email deliverability, shaping whether your messages reach inboxes or vanish into [spam](https://palisade.email/learning/understanding-spam-emails). By implementing protocols like [SPF](https://palisade.email/learning/what-is-spf), [DKIM](https://palisade.email/learning/what-is-dkim), and [DMARC](https://palisade.email/learning/what-is-dmarc), keeping email lists clean, and crafting quality content, you can cultivate a trusted IP reputation that secures reliable delivery. Whether you’re a business chasing conversions or an individual sending personal emails, a strong IP reputation protects against [phishing](https://palisade.email/learning/what-is-phishing) and [spoofing](https://palisade.email/learning/what-is-spoofing), ensuring your communications thrive in a secure email ecosystem.