testmxlookup(1) on Linux
The text dc7b86a76c2d, as Debian 10 (Buster) shipped it.
Look up mail relays for a domain
Flags it lists
-
--dnssec -
--udpsize
The text dc7b86a76c2d, as Debian 10 (Buster) shipped it.
Look up mail relays for a domain
--dnssec
--udpsize