AUTHPROBLEM.comEmail Authentication Analysis

Use this page to check SPF, DKIM, and DMARC together for one domain. SPF helps publish which systems are allowed to send mail for a domain, DKIM publishes a selector-based public key so message signatures can be validated, and DMARC tells receiving servers how to apply policy and reporting when SPF or DKIM alignment fails.

Enter the domain name once to run the core SPF and DMARC checks. The DKIM selector and sending IP address are optional, but adding them allows more detailed diagnostics: the selector lets the DKIM key record be checked, and the sending IP lets the SPF section evaluate whether that sender is likely to pass SPF for the domain. If you leave the selector blank, the site will still run SPF and DMARC checks. You can also use the dedicated SPF, DKIM, DMARC checkers for the same domain if you want to focus on one authentication layer at a time.