DFY GTM Systems

Free MX Record Checker Look Up Mail Servers for Any Domain

MX records tell the world where to deliver your mail and tell you whether a lead's domain can even receive email. Enter a domain to list its mail servers, priorities, and identify the provider (Google, Microsoft, and others).

How this check works

  1. 01

    Queries the domain's MX records and lists them by priority (lower = preferred).

  2. 02

    Matches known provider hostnames (aspmx.l.google.com → Google Workspace, outlook.com → Microsoft 365).

  3. 03

    Flags domains with no MX records sending to addresses there will hard bounce.

How to fix common problems

No MX records on your domain

You cannot receive replies. Add your provider's MX records Google Workspace and Microsoft 365 both document the exact values.

Stale MX after migration

After switching providers, remove the old MX records; leftover entries can split delivery between two systems.

Example

aspmx.l.google.com (priority 1) plus four alternates = Google Workspace. smtp.secureserver.net = GoDaddy mail. The pattern identifies the provider instantly.

FAQ

What is an MX record?
An MX (Mail Exchanger) record specifies which servers accept email for a domain, with a priority number lower numbers are tried first.
Can a domain have no MX record?
Yes, and it typically cannot receive email. Some domains fall back to A-record delivery, but for verification purposes, no MX means undeliverable.
Why check a lead's MX records?
It confirms the mailbox domain can receive mail. Dropping no-MX addresses before sending removes the largest source of hard bounces.

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