Email testing and DNS tools
Use MailSlurp tools to configure and validate email DNS, authentication, deliverability, and client compatibility. Popular queries this page targets include dns lookup, spf checker, dkim checker, dmarc checker, email spam checker, email blacklist checker, and mx lookup.
DNS lookup
Start here to troubleshoot SPF, DKIM, DMARC, MX, and routing issues.
DNS propagation checker
Verify when SPF, DKIM, DMARC, and MX DNS updates are fully visible.
DMARC checker
Validate DMARC policy, alignment, and reporting configuration.
DMARC domain lookup
Fetch DMARC DNS records and inspect warnings, tags, and validity.
SPF checker
Check SPF DNS records and validate authorized senders for your domain.
SPF record generator
Generate SPF TXT record values with safer rollout guidance.
DKIM checker
Validate DKIM TXT records and selector configuration for signed mail.
DKIM record generator
Generate DKIM selector records for signed email setup.
Email header analyzer
Analyze raw email headers to troubleshoot routing, auth, and deliverability.
Email spam checker
Run a spam-risk checklist across authentication, content, and headers.
Email blacklist checker
Investigate sender blacklist exposure and remediation steps.
Reverse DNS lookup
Validate PTR records and sender infrastructure identity.
Inbox placement test
Run placement checks and pre-send deliverability gates.
DMARC record generator
Create DMARC TXT record values with policy and reporting tags.
DMARC record validator
Validate required DMARC tags with a pass/fail checklist.
MX lookup
Check MX DNS records for a domain and verify email routing.
BIMI checker
Validate BIMI readiness requirements and jump into live DNS checks.
BIMI domain lookup
Run a direct BIMI DNS lookup for live record validation.
BIMI record generator
Generate BIMI TXT values for branded sender logos.
MTA-STS checker
Verify MTA-STS DNS policy and .well-known policy file.
MTA-STS record generator
Generate MTA-STS DNS and policy-file content.
TLS reporting checker
Validate TLS-RPT DNS records for SMTP TLS report delivery.
TLS reporting record generator
Build RFC 8460 TLS-RPT TXT values for your domain.
Email client compatibility checker
Analyze HTML email feature support across mailbox clients.
Plain authentication encoder
Encode SMTP AUTH PLAIN credentials to base64 format.
Fake email generator
Create disposable inboxes for QA, signup testing, and automation.
Why use MailSlurp tools?
Teams use these pages as practical alternatives to fragmented workflows in standalone lookup sites. Each tool is connected to MailSlurp's API-first platform, so you can move from one-off checks to automated validation in CI.
Need programmable messaging too? See the SMS API guide for send and receive workflows, OTP testing, and webhook automation.