fdnsmxalist(1) on Linux
The text 1f90dce5b813, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it. The page shows this text now.
resolve a list of MX records and their corresponding A records for hostname