I use Mailu as a simple mail server to manage the mails for one of my domain. This application uses ClamAv as an antivirus solution. To host this application I use VPS with only 4 GB RAM. Few weeks ago my Zabbix started sending notifications once a day that I have OOM on the mail server. It was strange as the problem appeared only once per day in the +/- same time. I tried to investigate the problem and found that the reason was in ClamAV...