Proxmox Mail Gateway 6.1 released


VIENNA, Austria – November 27, 2019 – Proxmox Server Solutions GmbH has released version 6.1 of its open-source email security solution Proxmox Mail Gateway. The anti-spam and anti-virus filtering solution is a complete operating system based on the latest Debian 10.2 (Buster) with a 5.3 kernel and uses the Postfix MTA, ClamAV and SpamAssassin. Deployed between the firewall and the internal mail server the Proxmox Mail Gateway works as a full-featured mail proxy and protects organizations against spam, viruses, trojans, and phishing emails.

Proxmox Mail Gateway 6.1 comes with updated SpamAssassin rules easily adjustable in the web-based user interface, added DKIM signature support for email authentication, and a new attachment quarantine. The high availability cluster usability brings improved handling of the Configuration and Rule changes.

Main new features of Proxmox Mail Gateway include:

DomainKeys Identified Mail (DKIM) signatures: Proxmox Mail Gateway 6.1 enables DKIM signatures for outbound emails improving email authentication. DKIM signing can be comfortably done in the web interface and it helps reduce phishing and spam and improves the sender’s email deliverability. With DKIM a domain name can be associated with an email message, thus verifying its authenticity. Signing in Proxmox Mail Gateway happens after processing the email with the internal Rule System, thus ensuring that it leaves the gateway with a valid signature. Inside a cluster, the use of one common SpamAssassin selector minimizes the overhead for adding the required DNS entries.

Attachment Quarantine: Administrators can now handle quarantined attachments in the GUI. The action Remove Attachments delivers the complete email to the attachment quarantine. The administrator can inspect the quarantined attachments safely in the GUI panel and choose weather to download only selected parts of the email for further analysis or to deliver or delete the email. For safety reasons, access is restricted to administrators only.

Adjustable SpamAssassin Rule Scores via GUI: The default scoring of the SpamAssassin rule-set can be adjusted in the web interface. This allows to adapt the scoring to a specific environment, thus achieving better ham/spam detection rates. The scoring adds weight to the rules and rules, causing false positives, can be selectively disabled.

Improved handling of Configuration and Rule changes in a cluster: The filtering engine gets notified about a range of configuration changes which require a reload. The notification is propagated during the cluster sync thus reducing situations where you had to manually restart “pmg-smtp-filter”.

Experimental: Support for Before Queue filtering: Proxmox Mail Gateway 6.1 can optionally reject an email during the SMTP dialogue, instead of accepting it and silently discarding unwanted email. By answering with a permanent failure code (554), there is no need to generate a non-delivery report, as this could cause the system to get blacklisted, due to Backscatter. This is an experimental feature because it needs to be explicitly enabled in /etc/pmg/pmg.conf and is currently not compatible with the tracking center.

Further enhancements include:


Proxmox Mail Gateway is released under the GNU AGPLv3. It is available as a bare-metal ISO install with an installation wizard that automatically installs and configures all necessary components on the host eliminating manual installation configuration. The ISO install contains the full feature-set and can be downloaded at

Technical enterprise support is available from Proxmox Server Solutions. Subscription pricing starts at EUR 99 per host and year for unlimited users and provides access to the enterprise package repository with regular updates via the web interface and to support from the Proxmox team.

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video whats new proxmox mail gateway 6 1

About Proxmox Mail Gateway

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 only 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 central web-based interface. Proxmox filters the whole 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 GmbH

Proxmox is a provider of powerful yet easy-to-use open-source server software. Enterprises regardless of size, sector or industry use the stable, secure, scalable, and open Proxmox solutions to deploy efficient, agile and simplified IT infrastructures, minimize total cost of ownership, and avoid vendor lock-in. Proxmox also offers commercial support and training to ensure business continuity to its customers. Proxmox Server Solutions GmbH was established in 2005 and is headquartered in Vienna, Austria.

Press contact:
Daniela Häsler, Proxmox Server Solutions GmbH

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