MX Lookup
Query registered mail servers responsible for routing incoming messages. Check mail server priorities and preferences securely.
Frequently Asked Questions
Domains typically specify multiple redundant mail exchange servers to guarantee email delivery. If the primary mail server goes down, sending systems will fall back to secondary or tertiary mail servers in the queue.
If no MX record exists, sending systems may attempt to fall back to the domain's root IPv4 'A' record to deliver email. However, many modern mail servers reject this fallback, resulting in bounced emails.