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Look up the MX records of a domain

harmlessDNSdebian, ubuntu
Adjust the values, the command updates live
user@server
dig +short example.com MX

Lists the responsible mail servers with their priority, lower numbers are tried first. Useful after migrations or provider changes to check whether incoming mail reaches the right server. The target name of an MX record must have its own A or AAAA record, a CNAME is not allowed there.

Also searched as

  • which mail server handles my domain
  • check mx record
  • emails not arriving after migration

Related one-liners

All in DNS

Check a domain's DKIM key in DNS

$dig +short default._domainkey.example.com TXT
harmlessDNS

Look up the reverse DNS (PTR) of an IP address

$dig +short -x 203.0.113.10
harmlessDNS

Show the DMARC policy of a domain

$dig +short _dmarc.example.com TXT
harmlessDNS

Show the SPF record of a domain

$dig +short example.com TXT | grep -i "v=spf1"
harmlessDNS

Verify reverse DNS of a mail server IP (FCrDNS)

$ptr=$(dig +short -x 203.0.113.10 | head -n 1); echo "PTR: $ptr"; dig +short "$ptr" A
harmlessDNS

Check DNS propagation across public resolvers

$for ns in 1.1.1.1 8.8.8.8 9.9.9.9 208.67.222.222; do echo "$ns: $(dig +short @$ns example.com A | tr '\n' ' ')"; done
harmlessDNS

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