Hermes Secure Email Gateway is a Free Open Source Ubuntu 20.04 LTS Server based Email Gateway that provides Spam, Virus and Malware protection, full in-transit and at-rest email encryption as well as email archiving. It features the latest email authentication techniques such as SPF, DKIM and DMARC.
Spamassassin does not update automatically. Issue is caused by CRON=0 in the /etc/default/spamassassin file.