Check DNS, email security, HTTPS headers and TLS certificate to find common issues in a domain’s technical health.
DNS records explained: what A, AAAA, MX, TXT, CNAME, NS, CAA and SOA mean and how they affect websites, email and domain security.
Read moreMX records explained: how mail servers are prioritized, which DNS mistakes stop delivery and how MX connects with SPF and DMARC.
Read moreSPF explained: which servers may send email for a domain, common SPF mistakes and why SPF should be combined with DKIM and DMARC.
Read moreDMARC explained: how policy, reporting, SPF, DKIM and alignment protect the domain’s From address against spoofing and phishing.
Read moreDKIM explained: how email signatures, selectors and public DNS keys show that a message was signed by the right domain.
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