MX Record Lookup
1. Enter Domain
Load Sample
2. Mail Server Records
Results for: –
| Priority | Mail Server (Hostname) | TTL |
|---|
How to Use MX Record Lookup
- Type in a domain name (e.g., example.com).
- Initiate the search.
- View the list of mail exchange servers and their priority values.
Formulas and Technical Logic
MX (Mail Exchanger) records specify the mail servers responsible for accepting email messages on behalf of a domain. An MX lookup performs a DNS query specifically for the MX resource record. The results include a preference or priority value. Lower numerical values signify higher priority. Mail transfer agents attempt delivery to the lowest-numbered server first.
Key Features
- Retrieves all MX records for a given domain.
- Sorts servers by priority automatically.
- Validates MX record syntax.
- Helps diagnose email delivery failures.
Reference Table: MX Priority Examples
| Priority | Server Name | Routing Behavior |
|---|---|---|
| 0 | primary.mail.server | First attempt target |
| 10 | backup1.mail.server | Used if priority 0 fails |
| 20 | backup2.mail.server | Used if priority 10 fails |
Frequently Asked Questions
What happens if all MX records have the same priority?
If multiple MX records share the lowest priority, the sending server will randomly select one to balance the load.
Can an MX record point to an IP address?
No. RFC specifications require MX records to point to a valid hostname (an A or AAAA record), never directly to an IP address.