MX Record Lookup
Show the mail-exchange records on any domain. The servers that accept inbound email. MX records are the foundation of email delivery; missing or misconfigured MX is the most common cause of "mail to your domain just disappears." This tool returns each MX host with its priority value.
Reading the result
Priority determines order: lower number = higher priority. Senders try the lowest-priority host first; if it's unreachable, they fall back to the next. Most domains list 2-5 MX records for redundancy.
Common patterns: Google Workspace points all priorities to smtp.google.com or aspmx.l.google.com + four ALT hosts. Microsoft 365 points to <tenant>-com.mail.protection.outlook.com.
Frequently asked questions
What is an MX record?▾
An MX (mail exchange) record is a DNS record that names the mail servers responsible for receiving email for a domain, each with a priority number. Senders look up your MX records to know where to deliver mail.
How do I check a domain's MX records?▾
Enter the domain above and this tool lists every MX host with its priority and resolves the underlying A/AAAA addresses. Or query it directly: dig MX yourdomain.com +short.
What does MX priority mean?▾
Priority sets the delivery order: a lower number is tried first. Senders fall back to the next-higher number if the preferred host is unreachable. Most domains list two to five MX records for redundancy.
Do MX records affect SPF, DKIM, or DMARC?▾
MX records govern inbound delivery, while SPF, DKIM, and DMARC govern authentication of outbound mail, so they are separate. That said, the SPF mx mechanism authorises your MX hosts to send, which is one place the two overlap.