Multi Webtools

Useful Tools & Utilities to make life easier.

MX Lookup

Instantly find a domain MX servers, priorities, and routing status to troubleshoot email delivery and verify migrations.


MX Lookup

Introduction

Email delivery depends on correct MX (Mail Exchange) records. This MX Lookup tool shows which mail servers handle email for any domain, so you can troubleshoot deliverability, verify migrations, and prevent lost mail without command-line tools.

What is this tool?

An MX record tells the internet which server receives email for a domain. Domains can have multiple MX records with priorities; lower numbers are tried first. If MX is missing or mis-prioritized, email can bounce or disappear. This tool queries DNS live and lists each MX host with its priority so you can confirm routing.

Why use this tool?

- Deliverability checks: Confirm a domain points to the intended provider (Google Workspace, Microsoft 365, Zoho, self-hosted).
- Post-migration verification: Ensure old MX records are removed and new ones are live.
- Troubleshooting bounces: Catch typos, stale entries, or wrong priorities.
- Security sanity: Spot unexpected MX changes or misconfigurations.
- Onboarding audits: Verify client domains before sending email.

How to use it

1) Enter a domain (e.g., example.com).
2) Click “MX Lookup.”
3) Review MX hosts and priorities (lower number = higher priority).
4) Compare against your provider’s required MX set.
5) If wrong, update DNS at your domain host and wait for TTL/propagation.

Example

Input: example.com
Output:
- ASPMX.L.GOOGLE.COM (priority 1)
- ALT1.ASPMX.L.GOOGLE.COM (priority 5)
- ALT2.ASPMX.L.GOOGLE.COM (priority 5)
- ALT3.ASPMX.L.GOOGLE.COM (priority 10)
- ALT4.ASPMX.L.GOOGLE.COM (priority 10)
Interpretation: Email routes to Google; priority 1 is tried first, then 5, then 10.

FAQ

Do you store my lookups?

No—queries fetch live DNS only and aren’t retained.

Why do results differ from what I set?

DNS propagation and caching, retry after TTL or from another network.

Does this check SPF/DMARC?

This page focuses on MX, use separate tools for SPF/DMARC/SMTP tests.

What about IPv6?

MX points to hostnames; those can have A (IPv4) and AAAA (IPv6). Resolve the hosts to see their IPs if needed.

How do I fix wrong MX?

Update MX at your DNS provider to match your email service exactly (hosts + priorities), remove stale entries, save, and wait for propagation.

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