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Free tools

Free email tools

Check an address, test a domain and decode a bounce message. Everything here is free and works without an account.

@Email address checkerCheck whether one email address is valid, risky or disposable. A few free checks without an account.Open the tool → MXMX lookupSee the mail servers of any domain and whether it can receive email.Open the tool → SPFSPF, DKIM and DMARC checkerTest your email authentication records and get plain-language advice.Open the tool → ⚠Disposable email checkerFind out whether a domain belongs to a known throwaway email provider.Open the tool → 5xxEmail error codesLook up a bounce message such as 550 5.1.1 and see how to fix it.Open the tool →

Why use these tools

  • They answer one question quickly, without sign-up or software to install.
  • They read public DNS records and mail-server answers only. No email is sent to the people you check.

Frequently asked questions

Are the tools really free?

Yes. The domain tools and the error-code library are free without an account.

Do you store the domains or addresses I check?

The domain tools do not store what you enter. Results are cached briefly to keep the service fast.

Which tool should I start with?

Start with the email address checker for one address, or the SPF, DKIM and DMARC checker if your messages land in spam.