Free deliverability tool · Coming soon
MX record lookup
MX records tell other servers where to deliver mail addressed to your domain. They govern receiving, not sending — but a broken MX means bounce notifications and replies never reach you, which makes sending problems invisible.
Under active development: The live DNS engine for MX lookup is currently being built. Test the interactive preview below to explore what it evaluates.
Preview Diagnosis — example.com
Sample demonstration- PassRecords found
3 - PassPrimary
10 · aspmx.l.google.com - PassBackups
20 · alt1 · 30 · alt2Distinct priorities, correctly ordered.
- PassCNAME targets
noneAn MX pointing at a CNAME is invalid and some servers reject it.
Healthy — three exchangers with distinct priorities, all resolving.
SadaSend runs these checks continuously on your sending domains, and refuses to send until they pass — so mail Gmail would reject never leaves.
Read the docsWhat this checks
- MX records exist and resolve to real hosts
- Priorities are distinct and ordered sensibly
- No MX points at a CNAME, which is invalid
- Every target resolves to an A or AAAA record
Questions
Other tools
- SPF checkerSoonCheck an SPF record, resolve every include, and count DNS lookups against the limit of ten.
- DKIM validatorSoonFetch a DKIM public key by selector, check the key length, and verify the record parses.
- DMARC checkerSoonParse a DMARC record and explain what it actually does to mail that fails authentication.
- Blocklist checkSoonQuery major blocklists for an IP address or sending domain.
- Inbox placement testSoonSend one message to seed addresses across major providers and see where it actually lands.