Hermes Secure Email Gateway is a Free Open Source Ubuntu 18.04 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.
ReFork from zedzedtop for of http://sourceforge.net/projects/mailzu/ MailZu is a simple and intuitive web interface to manage Amavisd-new quarantine. Users can view their own quarantine, release/delete messages or request the release of messages. This fork of MailZu is written in PHP and requires Amavisd-new version greater than 2.7.0