MX Lookup
List a domain's mail exchangers, sorted by priority, with their IPs.
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Enter a domain above and press Run to start the check.
About the MX Lookup
MX Lookup retrieves a domain's mail exchanger records, which tell sending servers where to deliver email for that domain. Results are sorted by priority, with lower values preferred, and each mail server is resolved to its IP address. It is the go-to tool for verifying mail routing and troubleshooting why messages to a domain are or are not being delivered.
How to use
- Enter the domain whose mail servers you want to inspect.
- Run the lookup to retrieve the MX records.
- Review the records sorted by priority along with each server's IP.
Frequently asked questions
- What does MX priority mean?
- Priority sets the order in which sending servers try mail exchangers; lower numbers are tried first. Equal priorities are used for load distribution.
- Can a domain have multiple MX records?
- Yes. Multiple MX records provide redundancy, so if the primary mail server is unavailable, senders fall back to the next priority.
- What if a domain has no MX record?
- Without an MX record, some senders fall back to the domain's A record, but many will not. Publishing explicit MX records is the reliable approach.