Proxmox Mail Gateway 8.2 launches with SpamAssassin 4.0.1, enhanced rule system, and more

VIENNA, Austria – February 27, 2025 – Enterprise software developer Proxmox Server Solutions GmbH ("Proxmox" or the "Company") today released Proxmox Mail Gateway 8.2, the latest version of its open-source email security solution. The Mail Gateway platform is a complete operating system based on Debian 12.9 “Bookworm”, but defaulting to the newer Linux kernel 6.8 and allowing for opt-in use of kernel 6.11. It includes ZFS 2.2.7 and SpamAssasin 4.0.1 with updated rulesets.

The anti-spam and antivirus filtering solution functions as a full-featured mail proxy, that is deployed between the firewall and the internal mail server. It protects organizations against threats, such as spam, viruses, Trojans, and phishing emails.

What’s new in Proxmox Mail Gateway 8.2

• Single sign-on: This version simplifies access management by integrating support for multiple authentication realms in the backend login. This eliminates the need to manage specific authentication details, enabling administrators to log into Proxmox Mail Gateway using single sign-on (SSO) authentication schemes with the new OpenID Connect as the first supported authentication protocol. This enables logging in through public as well as self-hosted services like Keycloak, Zitadel or LemonLDAP::NG.
• Enhanced rule system: The Proxmox development team adds further improvements to the configuration options of the comprehensive object-oriented rule system, by which the mail flow can be controlled and filtered. The filtering of the mail's content by Content-Type can now be configured to ignore information from the filename and the Content-Type header field, and to rely solely on file signature based detection, allowing for accurate filtering of attachments. Furthermore, the filtering of mail header fields can now be restricted to the top header section, thereby providing the option to exclude headers in attached emails from the filter.
• DKIM signature for emails generated by Proxmox Mail Gateway: Users can now set the From-header for emails generated by Proxmox Mail Gateway, like for example for notifications from the rule system, admin reports, or backup notifications. These emails are signed with DKIM if the installation uses the header information to obtain the domain for signing.
• Automated and unattended installation: Proxmox Mail Gateway now supports automated and unattended installation making large deployments significantly easier. Proxmox offers a ‘proxmox-auto-install-assistant’ tool that fully automates the setup process on bare-metal. Automated installation allows for the rapid deployment of Proxmox Mail Gateway hosts without the need for manual access to the systems, saving time and reducing the risk of errors. To use this method, an answer file must be prepared with the necessary configuration settings for the installation process. This file can be provided directly in the ISO, on an additional disk such as a USB flash drive, or over the network. Tailor-made configurations for customized deployments can be achieved by running a custom script on first boot after an automated installation.

Availability

Proxmox Mail Gateway is released under the GNU Affero GPL, v3 and is available as an ISO download, which can be installed on bare metal or on a virtual machine. The ISO contains an installation wizard that automatically installs and configures all the necessary components on the host. This eliminates the need for manual configuration later. The ISO contains the complete feature-set and is available for download.

Additionally, you can install Proxmox Mail Gateway as a container appliance inside Proxmox VE.

For enterprise use, Proxmox Server Solutions GmbH offers a subscription service that provides, at all levels, access to the extensively tested Enterprise Repository. This repository provides regular updates via the web interface and is recommended for production use. At the Basic and higher subscription levels, technical support from the Proxmox team is also available. Subscription prices start at EUR 180 per host per year for unlimited users and domains.

Further information:

Release Notes - https://pmg.proxmox.com/wiki/index.php/Roadmap
Forum Announcement: https://forum.proxmox.com

###

About Proxmox Mail Gateway
Proxmox Mail Gateway is the leading open-source email security solution, protecting your mail server against all email threats from the moment they emerge. Organizations of any size can easily deploy and implement the comprehensive anti-spam and antivirus platform in just a few minutes. Deploying the full featured mail proxy between the firewall and an internal mail server allows you to control all incoming and outgoing email traffic from the central, web-based interface. Proxmox filters all email traffic at the gateway before it reaches the mail server, protecting businesses against email attacks and other malicious threats. Proxmox Mail Gateway is open-source software, licensed under the GNU AGPLv3. Enterprise support subscriptions are available from Proxmox.

About Proxmox Server Solutions
Proxmox provides powerful and user-friendly open-source server software. Enterprises of all sizes and industries use Proxmox solutions to deploy efficient and simplified IT infrastructures, minimize total cost of ownership, and avoid vendor lock-in. Proxmox also offers commercial support, training services, and an extensive partner ecosystem to ensure business continuity for its customers. Proxmox Server Solutions GmbH was established in 2005 and is headquartered in Vienna, Austria. To learn more visit https://www.proxmox.com or follow us on LinkedIn or on YouTube.