I opened /var/log/syslog and saw that every half an hour i have 2 records
Oct 9 07:09:01 mydomain CRON[11676]: (root) CMD ( [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean)
Oct 9 07:09:02 mydomain msmtp: host=smtp.sendgrid.net tls=on auth=on
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