MX Record Lookup

An MX (Mail Exchange) record tells the internet which servers accept email for your domain. Each record holds a hostname (like aspmx.l.google.com) and a priority number (like 10); when someone sends you a message, their server looks up your MX records and delivers to the lowest-numbered one first.

Every domain that receives email needs at least one MX record - without one, mail bounces. Unlike SPF, which allows only a single record, a domain can and usually should have several MX records for redundancy. This tool shows all of them, sorted by priority, and identifies the provider behind the hostnames.

Each MX record has a priority number, and lower numbers are tried first - a record at priority 1 is preferred over priority 10. Typical ranges are 1 to 5 for the highest priority, 10 for a standard primary, 20 for a secondary or backup, and 30 or higher for overflow.

Multiple records at the same priority share load, chosen at random - simple round-robin balancing. Backup mail servers use higher numbers so they only receive mail when the primary is unreachable. When you read your results, every hostname should resolve to a valid IP, priorities should be staggered rather than all equal, and the hostnames should match your current provider.