Growth · alternatives · 2026

24 alternatives to Sender Policy Framework (SPF)

Your SPF configuration set right (RFC 7208)

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Sender Policy Framework (SPF) launched in 2022; newer entries below may have overtaken it.

1. 1
   SPF Record Checker▲244

   Lookup SPF Record and fix deliverability issues

   2024 · mailmodo.com · its alternatives →

2. 2
   Validate SPF▲1

   Validate Your Domain’s SPF Records

   2023 · validatespf.com · its alternatives →

3. 3
   DMARC Checker▲70

   Verify your DMARC, DKIM, and SPF settings with our free checker. Prevent bad actors from impersonating your domain and improve email deliverability.

   2024 · dmarcchecker.app · its alternatives →

4. 4WD
   Which DNS servers are you pointing to?▲283

   2020 · which.nameserve.rs · its alternatives →

5. 5
   RealMail▲355

   The email validation for SaaS

   2024 · realmail.dev · its alternatives →

6. 6
   Email Deliverability Toolkit▲9

   9 free tools to keep your email out of spam

   Aug 2026 · truelist.io · its alternatives →

7. 7
   Domain Scan Tools▲5

   Detect domain security issues before they hurt your business

   May 2026 · domainscan.tools · its alternatives →

8. 8
   Kit.domains▲198

   Hello Hacker News community, We are excited to announce the launch of KIT.DOMAINS, our new tool designed to simplify the management and monitoring of domains. KIT DOMAINS is a convenient and reliable solution for tracking the status of your domains and SSL certificates. With KIT DOMAINS, you will receive timely notifications about expirations and emerging issues, ensuring your sites remain operational and secure. Key features: - Expiration Tracking: Monitor the expiration dates of your domains to prevent accidental lapses. - SSL Certificate Monitoring: Keep your SSL certificates up-to-date…

   2024 · kit.domains · its alternatives →

9. 9
   OutboundQA▲6

   Catch cold email launch blockers before you send

   Jun 2026 · outboundqa.com · its alternatives →

10. 10
    Folderly Lens ▲107

    Domain health analysis for high performance email campaigns

    Jul 2026 · lens.folderly.com · its alternatives →

11. 11MD
    Make domain verification as easy as verifying an email or phone number▲86

    Hi HN, This is a project [1] I've been working on for a little while and I'm interested in your feedback and point of view. Many of us would have verified a domain name by pasting a string into a DNS TXT record. Some providers ask us to store this DNS TXT record at a domain using a DNS label like "_provider" e.g. _provider.yourdomain.com, and some providers ask that you do it at the zone apex (God help us [2]). The Domain Verification protocol stores a DNS TXT record at a DNS name derived from a hashed "verifiable identifier" (think email, telephone, DID), enabling anyone that can prove…

    2023 · domainverification.org · its alternatives →

12. 12
    SMTP Field Manual▲49

    A collection of SMTP error codes from major inbox providers.

    2019 · smtpfieldmanual.com · its alternatives →

13. 13IC
    I crossed a thesaurus with a domain availability checking API▲113

    2013 · domainmasher.com · its alternatives →

14. 14
    EmailAuth.app▲6

    Email authentication & deliverability checker

    2025 · emailauth.app · its alternatives →

15. 15
    Observe Domains▲78

    Monitor domain settings, SSL certificates, expiration dates

    2022 · observe.domains · its alternatives →

16. 16
    Self-Validating Email Aliases for Postfix▲28

    Mentally computable verification codes for email aliases implemented as a postfix tcp table; uses asyncio. - m3047/trualias

    2019 · github.com · its alternatives →

17. 17
    Email Blocklist Checker▲20

    Emails Landing in Spam? 1-click to know what went wrong.

    2020 · its alternatives →

18. 18
    Email Deliverability API & Checker▲2

    Instantly audit SPF, DKIM & DMARC to stop landing in spam.

    Aug 2026 · web-production-80c77.up.railway.app · its alternatives →

19. 19
    Deep Email Validator▲51

    Validates regex, typos, disposable, dns and smtp. Contribute to mfbx9da4/deep-email-validator development by creating an account on GitHub.

    2020 · github.com · its alternatives →

20. 20
    Identifying the DNS server used to fulfill a HTTP request▲17

    Identifying the DNS server used to fulfill an HTTP request

    2013 · 5f5.org · its alternatives →

21. 21
    Email Verifier▲50

    Verify your email list before you hit send

    Aug 2026 · mailercloud.com · its alternatives →

22. 22
    Domain DMARC Checker▲6

    Scan your domain for DMARC, SPF, DKIM, BIMI, TLS-RPT, and MTA-STS records and improvement advise.

    May 2026 · dmarcdefender.io · its alternatives →

23. 23
    DMARC Checker▲5

    Ensure your emails pass DMARC/DKIM/SPF authentication

    2024 · dmarcchecker.app · its alternatives →

24. 24
    Ldns.com – fast DNS lookups from the URL bar▲7

    I built LDNS because I'm constantly curious about domain names - who owns them, which nameservers they use, how they're configured, and what their DNS records reveal. I wanted a fast, easy way to investigate domains right from my browser without juggling multiple tools. LDNS runs entirely client-side using Cloudflare's DNS over HTTPS. Just type a domain and instantly see: All DNS records with clickable filtering RDAP/WHOIS data with registrar info and expiration dates Email security configuration (SPF, DMARC, MTA-STS, BIMI) Export options (JSON, CSV, BIND zones, PDF reports) Try it at…

    2025 · ldns.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →