MX Record
A DNS entry that names the mail server responsible for receiving email for a domain, revealing which provider hosts an address.
An MX record, short for Mail Exchanger record, is the DNS entry that tells the world which server is responsible for receiving email for a given domain. When a message is sent, the sending system looks up the recipient domain's MX record to find where to deliver it. A domain can list several MX records with priority values so mail has a fallback path if the primary server is unavailable.
Why it matters for outbound
The MX record reveals which mailbox provider actually hosts a given address. A contact at a company domain might be on Google Workspace, Microsoft 365, or something else entirely, and the MX record is the honest source of truth. Knowing the real provider behind each address sharpens two things at once: list quality and deliverability strategy.
What MX lookups tell us
- Which provider, Google, Microsoft, or other, sits behind an address
- Whether a domain accepts mail at all, a useful signal during email validation
- Whether a domain is configured as a catch-all, which affects how confidently an address can be verified
- How to tailor sending so it matches each provider's expectations
How we use it
As a managed agency, we read MX data during list building to confirm a domain can receive mail and to map each segment of an audience to its true provider mix. That mapping feeds both our data and list building and our deliverability and inbox placement work, so the strategy for reaching a Microsoft-heavy industry differs from one that is mostly on Google. It is a small technical detail that quietly improves accuracy across the whole motion.
From definitions to pipeline
Outword turns outbound theory into a running motion. Book a call to see what that looks like for your team.