Is it necessary to make some additional configurations to send scheduled reports by email? I have created a scheduled task and put a following crontab format:
*/1 * * * *
However, there is nothing on my inbox
Kind of. Energy Logserver reports uses postfix for email delivery. Check systemctl status postfix to see if it's installed on your instance.
Here's our documentation entry about basic postfix configuration: https://kb.energylogserver.com/en/latest/02-Configuration/02-Configuration.html?#configure-email-delivery
systemctl status postfix