Deliverability and infrastructure

MX record

Mail exchanger record

Definition

An MX record is a DNS entry naming the mail servers that accept incoming email for a domain, which is where replies to your outreach are delivered.

MX record in practice

MX records point a domain at its inbound mail servers, each with a priority number where lower is preferred. Without them, replies to your cold email have nowhere to go, and a domain that sends mail but cannot receive it looks suspicious to receivers.

Every sending domain you set up for outbound needs working MX records pointing at the same provider as its mailboxes. MX records also reveal which email provider a company uses, which is a cheap technographic data point.

Check your MX records RFC 5321: Simple Mail Transfer Protocol

Direct connections. Open the full map

Last updated 2026-10-14 by Ishan Vats.

Connected to

Part of

Sending domainA sending domain is the domain your outbound email is sent from, often a separate lookalike of your main domain to protect its reputation.

Feeds into

See where MX record fits in a real build.

Book the free 30 minute signal audit. We map the buying signals for your ICP live on the call, and show you where MX record sits in the system we would build.

Pick a time in the calendar below to schedule a 30 minute call with me.

01You talk. Who you sell to and what you send today.
02We map. The signals that fire for your ICP and the two to start with.
03You keep it. The signal map and a budget range, whether or not you build with us.

Ishan Vats, founder of IV Consulting. We run our own outbound on the same system.

More free GTM tools: Signal library · Email domain checker · Cold email calculator · GTM glossary · GTM and CRM setup

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