Email & SMTP Tools
Comprehensive tools for email authentication, deliverability testing, header analysis, and SMTP diagnostics. Perfect for email administrators, marketers, and developers.
Email Header Analyzer
Parse and analyze email headers to trace message paths, identify mail servers, and extract authentication results. Decode Received headers, Message-IDs, and routing information for troubleshooting delivery issues.
Analyze HeadersDKIM Record Generator
Generate DKIM DNS records with custom selectors and key sizes. Create cryptographic signatures to authenticate your email and prevent spoofing. Includes instructions for key pair generation and mail server configuration.
Generate DKIMDKIM Validator
Validate DKIM signatures by checking DNS records for specific selectors. Verify that your DKIM implementation is correct and that public keys are properly published. Essential for email authentication troubleshooting.
Validate DKIMEmail Deliverability Tester
Comprehensive test for email sending capability. Checks SPF, DKIM, DMARC, and MX records in one scan. Identify configuration issues that may cause emails to be rejected or marked as spam.
Test DeliverabilityMail Authentication Record Diff
Compare current and proposed SPF, DKIM, DMARC, BIMI, and MTA-STS records before a mail migration. Highlights removed selectors, policy changes, and risky authentication drift.
Compare RecordsMail DNS Cutover Planner
Plan TTL lowering, MX, SPF, DKIM, and DMARC change sequencing, validation windows, and stable TTL restoration during mail migrations.
Plan CutoverEmail Provider Rollback Planner
Define rollback triggers, owners, backout actions, freeze rules, and estimated recovery time before mail provider cutovers.
Plan RollbackSending Domain Warmup Planner
Build a daily volume ramp for new sending domains using complaint, bounce, domain age, and authentication readiness guardrails.
Plan WarmupShared IP Sender Risk Planner
Score sender streams before putting them on a shared IP pool, using complaints, bounces, engagement, volume, and owner accountability.
Plan IP RiskDMARC Alignment Analyzer
Check whether SPF return-path domains and DKIM signing domains align with the visible From domain under relaxed or strict DMARC alignment rules.
Analyze AlignmentSPF Lookup Budget Planner
Estimate SPF DNS lookup usage from include, a, mx, ptr, exists, and redirect mechanisms before publishing or migrating sender records.
Plan SPF BudgetDKIM Selector Rotation Planner
Plan DKIM key rotation timing with selector overlap, DNS TTL windows, mail queue lifetime, and safe old-selector removal steps.
Plan DKIM RotationDMARC Policy Ramp Planner
Create a staged DMARC enforcement rollout from monitoring to quarantine or reject using pct ramps, reports, and failure-rate guardrails.
Plan DMARC RampDMARC Report URI Checker
Parse rua and ruf reporting destinations, identify external report receivers, and check authorization records needed for external reporting.
Check Report URIsSender Authentication Coverage Matrix
Map sending platforms by From domain, SPF domain, DKIM domain, owner, and volume to estimate DMARC alignment coverage before enforcement.
Build MatrixBIMI Record Generator
Generate Brand Indicators for Message Identification (BIMI) records to display your logo in email clients. Requires DMARC enforcement and SVG logo format. Enhance brand visibility and trust in email communications.
Generate BIMIBIMI Readiness Checker
Check BIMI launch readiness by reviewing DMARC enforcement, BIMI TXT records, logo URL reachability, and optional VMC URL availability.
Check BIMI ReadinessMTA-STS Generator
Create MTA-STS policy files and DNS records to enforce TLS encryption for email delivery. Protect against man-in-the-middle attacks and ensure secure mail transport between servers.
Generate MTA-STSMTA-STS Policy Checker
Validate the live MTA-STS TXT record and hosted HTTPS policy file. Parse mode, max_age, MX patterns, and readiness warnings.
Check MTA-STSTLS-RPT Record Checker
Check SMTP TLS reporting records at _smtp._tls, parse report destinations, and spot missing or unsupported rua endpoints.
Check TLS-RPTEmail Blacklist Lookup
Check if your IP address is listed on major email blacklists including Spamhaus, SpamCop, SORBS, Barracuda, and more. Essential for maintaining good sender reputation and email deliverability.
Check BlacklistsMX Failover Planner
Model proposed MX priorities, backup coverage, provider diversity, and region diversity before making mail routing changes.
Plan MX FailoverSPF Record Generator
Build SPF records interactively with support for ip4, ip6, mx, a, and include mechanisms. Configure authorized mail servers and set enforcement policies. Prevent email spoofing and improve deliverability.
Generate SPFSMTP Tester
Test SMTP server connectivity on common ports (25, 465, 587). Verify that mail servers are accepting connections and responding correctly. Useful for diagnosing mail delivery problems and server configuration.
Test SMTPEmail Syntax Validator
Validate email addresses against RFC 5322 standards. Check format, length limits, MX records, and detect common typos in popular email domains. Ensure your mailing lists contain valid addresses.
Validate Email