Free deliverability tool
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.
Worked example — 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.
Start freeWhat 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 checkerCheck an SPF record, resolve every include, and count DNS lookups against the limit of ten.
- DKIM validatorFetch a DKIM public key by selector, check the key length, and verify the record parses.
- DMARC checkerParse a DMARC record and explain what it actually does to mail that fails authentication.
- Blocklist checkQuery major blocklists for an IP address or sending domain.
- Inbox placement testSend one message to seed addresses across major providers and see where it actually lands.