|dnsmx(1)||General Commands Manual||dnsmx(1)|
dnsmx - prints the MX records of fqdn
dnsmx prints the MX records of fqdn. If there are no MX records, dnsmx prints an artificial MX record, simulating the behavior of MTAs.
Normally dnsmx exits 0. If dnsmx encounters a temporary problem that prevents it from determining the list of MX records, it prints an error message and exits 111.