Proxmox Mail Gateway 7.2 releases: based on Debian Buster

Proxmox Mail Gateway is the leading open-source email security solution protecting your mail server against all email threats the moment they emerge. Organizations of any size can easily implement and deploy the comprehensive anti-spam and anti-virus platform in a few minutes. Deploying the full featured mail proxy between the firewall and an internal mail server allows to control all incoming and outgoing email traffic from the single web-based interface. Proxmox filters the whole email traffic at the gateway before it reaches the mail server and protects businesses against email attacks and other malicious threats. Proxmox Mail Gateway is open-source software, licensed under the GNU AGPL, v3. Commercial support subscriptions are available from Proxmox.

The Mail Gateway is a complete operating system based on Debian Stretch 9.5 with a 4.15 kernel. The anti-spam and anti-virus filtering solution functions like a full-featured mail proxy deployed between the firewall and the internal mail server and protects organizations against spam, viruses, Trojans, and phishing emails.

Changelog v7.2

• Based on Debian Bullseye (11.5)
• Latest 5.15 Kernel as stable default (5.15.74)
• Newer 5.19 kernel as opt-in
• ZFS 2.1.6
• SpamAssassin 3.4.6 (with updated rule-set)
• PostgreSQL 13.8

Changelog Overview

• Enhancements in the Rule system:
  • Improved handling of international emails
    • Support for UTF-8 characters in the rule system (e.g. matching non-ASCII subjects).
    • Better handling of SMTPUTF8 emails (the smtp-dialogue already contains non-ASCII data, the headers contain UTF-8 data without MIME encoding).
  • Proper encoding for template-variable information in the Notifications and Modify Field actions.
  • MatchField now matches all occurrences of a header – not only the first one – especially relevant for Received headers.
  • Deprecated the Attach, Counter and ReportSpam Actions.

  While they were present in the code of Proxmox Mail Gateway, they were never exposed in the GUI or API.

  All three have now been deprecated and will be removed with version 8.0.

• Improved Quarantine UX:
  • Quarantine interface for Administrators: many of the recent features for end-users in the Spam Quarantine have been ported to the administrator view:
    • Allow selection of multiple mails.
    • Context menu in the mail-listing.
    • Display the Receiver information in the Attachment and Virus quarantines and the Mail Info widget.
  • Augmented the information visualization in the Spam information grid.
    • The weight (number of points) and the type of impact (positive or negative) of SpamAssassin rules is now shown with colors and font-weights to make them easier to grasp.
    • The rule IDs and scores are using a monospaced font for better comparison of values.
  • Colorized Deliver and Delete actions improves intuitive handling of the common actions.
  • Display of attachments in the Spam and Virus quarantines (for a more complete overview of the mail).
  • Attachment and Virus quarantines can now optionally be filtered by Receiver – especially helpful in larger deployments.
  • Display of descriptions for locally defined SpamAssassin rules.
  • Fix displaying the quarantine interface on narrow screens: Part of the action buttons were cut off and not reachable through scrolling.

• Enhancements in the web interface (GUI):
  • The Postfix queue interface now displays the mail’s headers in a decoded way – so that you see it as in your mail user agent.
  • The Statistic time selector now does not show non-existent day/month combinations (e.g. the 31. Day of February).
  • Better spacing of the Field labels in the rule object edit windows.
  • Improved translations, among others:
    • Dutch
    • German
    • Italian
    • Polish
    • Traditional Chinese
    • Turkish

• Support Proxmox Offline Mirroring & Subscription Handling
  • Proxmox Offline Mirror: The tool supports subscriptions and repository mirrors for air-gapped systems. The newly added proxmox-offline-mirror utility can now be used to keep Proxmox Mail Gateway hosts, without access to the public internet up-to-date and running with a valid subscription.

• Notable General Improvements and Bugfixes:
  • Add IP networks uniquely to template variables (postfix.mynetworks)

  If you had multiple entries in your transport directory, all pointing to the same host, they were added multiple times to the variable used in the configuration system.

  • Support for Proxmox Backup Server Namespaces.
  • Spam report emails now correctly display the From header, even if it contains a comma (e.g. "Lastname, Firstname" <firstname.lastname@domain.example>).
  • The left-over config file /etc/apt/apt.conf.d/75pmgconf was removed, enabling the automatic removal of obsolete kernel packages, which can take up significant amounts of space.
  • SpamAssassin updates now handle updates to multiple channels correctly on the first run.
  • Improved parsing of email attributes from LDAP profiles.
  • Changing the directory to ‘/’ before running psql as postgresuser – preventing the printing of harmless but confusing warnings with various Proxmox Mail Gateway CLI utilities.
  • Support disabling TLS 1.2 and configuring TLS 1.3 ciphers for pmgproxy – following the change for pveproxy in Proxmox VE.

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