Find the mail servers (MX records) that receive email for a domain, including preference order, resolved IPs and network/ASN details.
An MX (Mail Exchanger) record tells sending servers where to deliver email for a domain. Lower preference values are tried first. If MX hosts do not resolve to an IP, or if SPF/DMARC are missing, mail can bounce or land in spam.
This MX lookup reports each host, TTL, IP and ASN, then runs quick related checks for SPF, DMARC and BIMI so you can spot common delivery problems in one place.
An MX record maps a domain to the hostname of a mail server that accepts email, with a preference (priority) number.
Senders try the lowest preference first. Backup MX hosts use higher numbers and only receive mail if primary hosts are unreachable.
Some domains fall back to the A/AAAA record for mail, but modern email setups almost always publish explicit MX records. Missing MX often means mail is not configured.