Email Tools
MX Record Checker
Check a domain's mail server (MX) records and their priority.
Enter a domain to check its mail server (MX) records and their priority.
JustChecker tracks your email deliverability configuration continuously.
Frequently Asked Questions
They check the same underlying MX record data - this version is grouped with the other email-security tools as part of a broader mail-deliverability workflow, alongside SPF, DKIM, and DMARC.
While priority itself is primarily about delivery routing/redundancy rather than security, a domain's complete mail setup (MX plus SPF plus DKIM plus DMARC) needs to be evaluated together - MX simply confirms where mail is even supposed to be delivered before authentication is checked.
Technically the DNS records can exist independently, but without an MX record the domain can't actually receive any email at all - the authentication records would be effectively moot since there's no mailbox to deliver validated mail to.
Often yes - major providers (Google Workspace, Microsoft 365, and others) use recognizable, distinctive MX hostname patterns, making the provider identifiable directly from the MX record values.
A domain used purely for a website (with email handled entirely through a different, separate domain) has no functional need for an MX record - this is a deliberate, valid configuration, not necessarily an oversight.
It provides redundancy if your primary mail server is temporarily unreachable, but modern managed email providers often handle this redundancy internally - a backup MX is more commonly seen with self-hosted mail infrastructure.