vacation.sendmail(1) on Linux
The text 661ef142c3b3, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
E-mail auto-responder
Flags it lists
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-I -
-U -
-d -
-i -
-j -
-l -
-x -
-z