MX lookup.
Find where mail to any domain actually lands. MX records sorted by priority, with email-provider detection (Google Workspace, Microsoft 365, Proofpoint, Mimecast, Amazon SES and 10+ more) and the underlying IPs.
What this tells you
MX priority order — receivers try the lowest priority number first. If you see two MXes at the same priority, mail is load-balanced between them. If the lowest priority is unreachable, mail tries the next one — that's how backup MX works.
Provider detection — most mail platforms put a recognisable signature in their MX hostnames. We match against known patterns for Google Workspace, Microsoft 365, ProtonMail, Zoho, Amazon SES, Proofpoint, Mimecast, Barracuda, MailRoute, FastMail and more — so you don't have to guess from a cryptic hostname.
Resolved IPs — the actual IPv4 addresses each MX hostname resolves to. Useful for blacklist checks, geographic-routing audits, and confirming what's really accepting mail for the domain.
No MX, but A/AAAA — the mail RFC says receivers should fall back to the apex A record if no MX exists. We surface that case explicitly so you know your domain is technically receiving mail through implicit-MX even without a published MX record.
Want to dig deeper?
Try the SPF/DKIM/DMARC checker for the full email-authentication picture, the blacklist checker to see if any of these MXes are listed, or the DNS lookup tool for everything else.
Privacy
Lookups happen in your browser via Cloudflare's public DNS-over-HTTPS endpoint. Edos Solutions doesn't log the domains you check, doesn't run any analytics on this page, and doesn't capture your IP.
Frequently asked questions
- What is an MX record?
- An MX (Mail Exchanger) record is a DNS record that specifies which mail servers accept incoming email for a domain. When someone sends mail to user@yourdomain.com, the sending server looks up your MX records to find where to deliver the message. Without MX records, mail to your domain cannot be delivered.
- What does MX priority mean?
- Each MX record has a priority number. The sending server always tries the lowest priority number first. If multiple MX records share the same priority, delivery is load-balanced between them. Higher priority numbers act as backup — they only receive mail if the lower-priority servers are unreachable.
- How can I tell which email provider a company uses?
- Look at the MX hostname. Most major providers embed a recognisable string: Google Workspace uses aspmx.l.google.com, Microsoft 365 uses mail.protection.outlook.com, ProtonMail uses protonmail.ch. This tool detects over 20 major providers automatically. If the hostname is a custom domain, the company likely runs their own mail infrastructure.
- What if no MX records are found for a domain?
- If a domain has no MX records but has an A record, the mail RFCs say senders should attempt delivery to the apex A record directly — this is called implicit MX. This tool surfaces that case explicitly so you know the domain is technically receiving mail even without published MX records. A domain with neither MX nor A records cannot receive email.