Is your mail actually landing?
MX, SPF, DKIM and DMARC — checked live, with plain-English notes on what's missing and why it matters, not just a pass/fail icon.
Free email health checker. Checks a domain's MX, SPF, DKIM and DMARC DNS records for common mail deliverability and anti-spoofing misconfigurations.
Rate limited to 10 lookups per minute. DKIM has no discovery mechanism — if you know your selector, enter it for a direct check; otherwise ~18 common ones are tried.