testmxlookup(1) on Linux
The text 8a451a1a08f7, as Debian 8 (Jessie) shipped it.
Look up mail relays for a domain
Flags it lists
-
--dnssec -
--udpsize
The text 8a451a1a08f7, as Debian 8 (Jessie) shipped it.
Look up mail relays for a domain
--dnssec
--udpsize