Check any domain's mail servers (MX records), detect the email provider, and grade MX health. Instant and free — no signup.
An MX (Mail Exchange) record is the DNS record that tells the world which mail server accepts email for a domain. A domain can list several MX hosts with different priority values (lower = tried first) for redundancy. If a domain has no MX record and no fallback A record, it simply cannot receive email — a guaranteed hard bounce.
An MX check tells you a domain can receive mail, but not whether a specific mailbox exists. To confirm a real address, use the email validator (SMTP probe) or clean a whole list with the bulk email cleaner. For the technical deep dive, see DNS & MX records explained.
An MX (Mail Exchange) record is a DNS record that tells other mail servers which host accepts email for a domain. A domain can have several MX records with different priority values; lower numbers are tried first. Without a valid MX (or a fallback A record), a domain cannot receive email.
Enter the domain (e.g. example.com) above and click Look up MX. This tool queries DNS live and shows each MX host with its priority, detects the email provider, and grades the MX setup. You do not need an account.
The grade reflects MX setup quality: A means multiple MX hosts on a recognized provider (redundant and reliable), B means either multiple hosts or a known provider, and C means a single unknown host. It is a quick signal of deliverability robustness, not a guarantee.