testmxlookup(1) on Linux
The text b716a9ef1fd7, as Debian 7 (Wheezy) shipped it.
Look up mail relays for a domain
Flags it lists
-
--dnssec -
--udpsize
The text b716a9ef1fd7, as Debian 7 (Wheezy) shipped it.
Look up mail relays for a domain
--dnssec
--udpsize