Check this out, it’s an automatic cron job that first saves the output of ‘df’ to a text file then emails it.

20 2 * * * df -Ph > /mnt/archivelimits.txt
30 2 * * * echo “This is the Server’s Archive Limits” | /bin/mail -s”Server Archive Limits” email1@domain.com email2@domain.com email3@domain.com email4@domain.com < /mnt/archivelimits.txt