Free tools
Check the DNS behind your email
Three small checkers for the records that decide whether your mail arrives: SPF, DMARC and MX. They run in your browser against public DNS, need no account, and store nothing.
SPF record checker
Finds the record, follows every include, counts the DNS lookups against the limit of 10, and flags +all, void lookups and duplicates.
Open the checkerDMARC record checker
Shows the policy, the reporting addresses, pct, subdomain and alignment settings, and the mistakes that make receivers ignore the record.
Open the checkerMX lookup
Lists the mail servers for a domain in priority order, names the provider, and checks that each host resolves.
Open the checker
Why these three records
MX records say where mail for your domain should be delivered. SPF says which servers may send as your domain. DMARC tells receivers what to do when a message fails, and sends you reports about who is sending. Between them they decide whether your email arrives in the inbox, the spam folder, or not at all, and most delivery problems trace back to one of them being missing, duplicated or pointing at a provider you left. Run all three on your domain; the result box on each checker links to the other two with the domain filled in.
If you are setting email up for the first time, you do not need the tools at all: OquMail shows the exact records for your domain and verifies them live. Our guides to the DNS checklist before launch and SPF, DKIM and DMARC failures cover the rest.
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