sendmail uses too much cpu

I am running Fedora 31 and time to time I get high CPU for dozen of seconds randomly during the time like every ten minutes or so that is caused by `sendmail`. So far I am not able find out why. Can you help me to find what is the root cause of it and how to prevent it. Momentarily I am not aware of any service/job that could run that process. It happens in computer idle state as well. Here is my observation so far my: When the usage of CPU is high I can `ps faux | grep sendmail` ps faux | grep sendmail /usr/bin/bash /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t -f Process `which sendmail` $ which sendmail /usr/sbin/sendmail $ ls -la /usr/sbin/sendmail lrwxrwxrwx 1 root root 21 Mar 3 11:14 /usr/sbin/sendmail -> /etc/alternatives/mta $ ls -la /etc/alternatives/mta lrwxrwxrwx 1 root root 22 Mar 3 11:14 /etc/alternatives/mta -> /usr/bin/esmtp-wrapper $ ls -la /usr/bin/esmtp-wrapper -rwxr-xr-x 1 root root 3378 Jul 25 2019 /usr/bin/esmtp-wrapper $ ls -la /usr/bin/esmtp-wrapper I tried see `mail` $ mail No mail for All files in `var/spool/mail/ are empty, /var/log/maillog` is empty. Any ideas?