# SenderReputation.org

> Free tools and educational resources for email deliverability. Check sender reputation, validate email authentication records, scan blacklists, and learn how to improve inbox placement. No signup required.

## Tools

- [Sender Reputation Checker](https://senderreputation.org/tools/sender-reputation-checker): Comprehensive A-F sender reputation score combining authentication, blacklist, DNS, and infrastructure analysis.
- [Blacklist Checker](https://senderreputation.org/tools/blacklist-checker): Scan 10+ of the most widely used DNS-based blacklists for any domain or IP address.
- [SPF Record Checker](https://senderreputation.org/tools/spf-checker): Validate SPF record syntax, DNS lookup count, and mechanism configuration.
- [DKIM Record Checker](https://senderreputation.org/tools/dkim-checker): Verify DKIM key publication, formatting, and encryption strength.
- [DMARC Record Checker](https://senderreputation.org/tools/dmarc-checker): Check DMARC policy, alignment settings, and reporting configuration.
- [Email Header Analyzer](https://senderreputation.org/tools/header-analyzer): Parse raw email headers to trace delivery path and identify issues.
- [MX Lookup](https://senderreputation.org/tools/mx-lookup): Look up mail exchange records and verify mail server configuration.
- [Reverse DNS Checker](https://senderreputation.org/tools/reverse-dns-checker): Verify PTR records match sending IPs for proper reverse DNS setup.
- [SPF Record Generator](https://senderreputation.org/tools/spf-generator): Build valid SPF records step by step without memorizing DNS syntax.
- [DMARC Record Generator](https://senderreputation.org/tools/dmarc-generator): Generate DMARC TXT records with proper policy and reporting settings.

## Guides

- [What is Sender Reputation?](https://senderreputation.org/guides/what-is-sender-reputation): Fundamentals of sender reputation and what factors ISPs use to evaluate senders.
- [Email Authentication Guide](https://senderreputation.org/guides/email-authentication-guide): Complete guide to setting up SPF, DKIM, and DMARC correctly.
- [Blacklist Removal Guide](https://senderreputation.org/guides/blacklist-removal-guide): Step-by-step guide to checking blacklist status, requesting removal, and preventing future listings.
- [Improving Email Deliverability](https://senderreputation.org/guides/improving-email-deliverability): Best practices for inbox placement, list hygiene, and sending practices.
- [DNS Records for Email](https://senderreputation.org/guides/dns-records-for-email): How to configure MX, SPF, DKIM, DMARC, and PTR records.
- [Understanding Bounce Rates](https://senderreputation.org/guides/understanding-bounce-rates): Hard vs soft bounces, acceptable rates, and how to reduce them.
- [Email Bounce Codes Reference](https://senderreputation.org/guides/email-bounce-codes-reference): Complete SMTP reply code and enhanced status code reference.

## Additional Resources

- [Email Deliverability Glossary](https://senderreputation.org/glossary/): 80+ email deliverability terms defined.
- [Bounce Code Lookup](https://senderreputation.org/bounce-codes/): Searchable database of SMTP error codes and enhanced status codes.
- [Blog](https://senderreputation.org/blog/): Tips, news, and insights on email authentication and deliverability.
- [About](https://senderreputation.org/about): Mission, methodology, and Sender Reputation Score grading system.