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linux - How to send an e-mail after a cron job

I have added a cron job for my incremental backup, and I configured it like this:




0 23 * * * /usr/bin/rsync -ravzX /mnt/external/project/ /media/backup/project/ | mail -s "Backup Success" admin@example.com



But i didn't receive any e-mails.
How can I find out what's wrong?

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