Audit says we're missing DNSSEC and CAA, does that affect email?
DNSSEC signs DNS answers so they can't be tampered with, for example via cache poisoning. CAA restricts which CAs may issue TLS certs for your domain. Neither is strictly required for mail, but both are recommended: DNSSEC strengthens MTA-STS and DANE, CAA prevents rogue certs on your MX hosts.
Try this first
- 1Check current status with dnssec-tools.org or mxtoolbox DNSSEC. Ask your registrar (TransIP, OpenProvider, Cloudflare) whether DNSSEC is enabled for your zone.
- 2Enable DNSSEC: at Cloudflare a single click, elsewhere often via DS record to your nameserver. Test on a sandbox domain first.
- 3Add CAA records: yourdomain.com. CAA 0 issue "letsencrypt.org" for LE, or the CA you use. Plus iodef for reporting.
- 4Mail context: DANE (TLSA records on MX) requires DNSSEC. Without DNSSEC, DANE is pointless.
- 5Verify externally (internet.nl) and check authoritative DNS errors. DNSSEC misconfig can make your domain unreachable.
When to bring us in
If you want DANE validation toward your MX (especially relevant for business mail to government, NTA 7516, Chamber of Commerce, Tax Authority), set up DNSSEC + DANE together.
See also
- Our emails land in spam for some recipientsAlmost always an SPF, DKIM, or DMARC setting that is wrong or missing, or a sender name that mimics a well-known brand.
- Someone reports receiving phishing emails "from us"Read: spoofing. Someone is abusing your sender name, not necessarily your actual mailbox.
- An email bounces (NDR): delivery failedThe NDR text usually states the exact reason. Reading it is step one.
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