Signal & Syntax · Email deliverability
What Is an MX Record?
An MX (mail exchanger) record is the DNS entry naming a domain's mail servers. Senders try the MX record with the lowest priority number first.An MX (mail exchanger) record is the DNS entry naming a domain's mail servers. Senders try the MX record with the lowest priority number first.An MX (mail exchanger) record is the DNS entry naming a domain's mail servers. Senders try the MX record with the lowest priority number first.
Also calledmail exchanger record
Example
acmecorp.com MX 1 aspmx.l.google.com
MX Record in Practice
With no MX record, senders fall back to the domain's A or AAAA record. A typo'd or parked domain fails the MX check before any mailbox test. MX targets also identify the mail provider, such as Google Workspace or Microsoft 365.With no MX record, senders fall back to the domain's A or AAAA record. A typo'd or parked domain fails the MX check before any mailbox test. MX targets also identify the mail provider, such as Google Workspace or Microsoft 365.With no MX record, senders fall back to the domain's A or AAAA record. A typo'd or parked domain fails the MX check before any mailbox test. MX targets also identify the mail provider, such as Google Workspace or Microsoft 365.
Where ScoreMachine Fits
Related Terms
Read the Guide
Guide
MX Records, SMTP Codes and Bounces Explained
How an email finds a mailbox, and how the server answers. Read the guide →Run the Checks on Your Own List
Upload a file in a free workspace, or walk through your use case with our team.