Domain Security Checker
Check if a domain has proper email authentication (SPF, DKIM, DMARC) configured.
Understanding Email Authentication
What is SPF?
SPF (Sender Policy Framework) is a DNS record that lists which mail servers are allowed to send email for a domain. It helps prevent spammers from sending emails with forged sender addresses.
What is DKIM?
DKIM (DomainKeys Identified Mail) adds a digital signature to emails. Receiving servers can verify that the email wasn't modified in transit and truly comes from the claimed domain.
What is DMARC?
DMARC (Domain-based Message Authentication) tells receiving servers what to do with emails that fail SPF or DKIM checks. It can instruct servers to reject, quarantine, or monitor suspicious emails.