mail-expire(1) on Linux
The text faacb433bc2a, 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.
program to extract outdated messages from mbox files
Flags it lists
-
--delete -
-t -
-u