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The reason I'm asking is under certain conditions I would like to change the email addresses that cron sends email to.
For example I have database of who is on vacation so I would like to remove their email address from cron.
seems only way to do this is to restart cron with -m argument each day, as people come and go on vacation each day.
How are you using cron -m? Are you passing it a script that sends mail to a group of people? If so, why not just put
MAILTO=cron-people
in your crontab, and define cron-people as a mail alias? Then you can just update that alias as necessary.
