Convurter

Email DNS

Email authentication triage

Email authentication problems usually require reading several DNS records together. MX, SPF, DMARC, and related TXT records provide public signals, but final delivery depends on provider behavior too.

Details

What to know

1

Start with MX records

MX records show where a domain says mail should be delivered. If MX is missing or unexpected, SPF and DMARC may not explain the real delivery issue.

2

Check SPF lookup and syntax signals

SPF records can fail because of missing records, duplicate records, include chains, syntax issues, or lookup depth. Treat SPF output as a DNS configuration signal.

3

Review DMARC policy carefully

DMARC policy, alignment mode, reporting addresses, and enforcement level affect how receivers may treat mail. A parser can help, but provider dashboards remain the source of delivery truth.

4

Avoid overclaiming deliverability

Passing public DNS checks does not guarantee inbox placement. Reputation, content, sending infrastructure, authentication alignment, and receiver rules still matter.

Related tools

MX Lookup MX Lookup for DOMAIN input and DNS-RECORDS output using Convurter servers. Server DNS-RECORDS SPF Record Checker SPF Record Checker for DOMAIN input and SPF-REPORT output using Convurter servers. Server SPF-REPORT DMARC Checker DMARC Checker for DOMAIN input and DMARC-REPORT output using Convurter servers. Server DMARC-REPORT DNS Lookup DNS Lookup for DOMAIN input and DNS-RECORDS output using Convurter servers. Server DNS-RECORDS DNS Propagation Checker DNS Propagation Checker for DOMAIN input and DNS-REPORT output using Convurter servers. Server DNS-REPORT

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