The code needs to be entered in as a "cron task". When in ssh, try the command:
crontab -e
This will bring you into a linux text editor, we'll assume "vi", which is somewhat complicated.
If crontab -e does in fact load the text editor (vi) to enter your cron tasks, do the following:
hit INSERT
(to enter vi's insert mode)
type, or copy/paste your cron command
hit ESC
type these 3 characters :wq
(write/quit command)
hit ENTER
If all goes well, it will say "cron updated". After that, enable the "send dailymail report" option on the Config page of ListMail and wait to see if you receive this message.