Proxmox releases Mail Gateway 9.1 with quarantine and backup encryption changes Proxmox Mail Gateway 9.1 adds updated system components, changes to the spam quarantine interface, and encryption for backups. It works as a mail proxy positioned between the firewall and internal mail servers, screening incoming and outgoing traffic for spam, viruses, Trojans, and phishing attempts. Updated system components Version 9.1 runs on Debian 13.5 Trixie and ships with Linux kernel 7.0 as the stable default. The release includes SpamAssassin 4.0.2 with continuously updated rulesets, ClamAV 1.4.4, PostgreSQL 17, and ZFS 2.4. These versions track the current major open-source security packages that the platform depends on. Quarantine interface changes Several updates apply to the web-based quarantine,…