free tools · mx checker
Check your MX records
Enter your domain to see where its mail is delivered, whether every MX host resolves, and which provider runs it.
Free, no account needed. Results in about 10 seconds.
About the MX check
MX records say which servers receive mail for your domain. Without them, replies to your emails have nowhere to go, and receivers count that against you.
The check also uses your MX to work out your mail provider, which is how it knows the right SPF include to suggest.
Fix it, then keep it fixed
Flaiir checks your whole domain for free, can write missing SPF and DMARC records at your DNS provider, and warms your mailbox while it watches where your mail lands.
Check my domain