==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2
- Deployed with iRedMail Easy or the downloadable installer? installer
- Linux/BSD distribution name and version: Debian 9.13
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Maria DB
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? No
====

PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
11894 root      20   0  226272 202140   3808 R 100.0  1.6 853:18.34 logwatch
17790 root      20   0  233184 208536   3956 R 100.0  1.7   3720:05 logwatch
27175 root      20   0  226272 202180   3836 R  99.7  1.6   2282:32 logwatch

The process starts daily and runs indefinitely and causes 50% CPU load while idling. If I end the process with kill it will be sent by email

/etc/cron.daily/00logwatch:
/etc/cron.daily/00logwatch: line 7: 10528 Killed                  /usr/sbin/logwatch --output mail
run-parts: /etc/cron.daily/00logwatch exited with return code 137

But I cannot determine what the process is not getting done.