Definition
MX records specify which servers receive email for a domain. They point to hostnames (not IPs) and include a priority value — lower numbers are tried first. Multiple MX records provide redundancy. Example: yourdomain.com MX 10 mail.yourdomain.com. Mail servers use MX records to find where to deliver email. Without MX records, email cannot be received.
Use the tool: MX Lookup — check mx record for any domain.