Proxmox Mail Gateway 6.4 released

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Proxmox Staff Member
Staff member
Apr 28, 2005
We are pleased to announce the availability of the new Proxmox Mail Gateway 6.4!

Proxmox Mail Gateway 6.4 is based on the latest stable release of Debian Buster 10.9 with a Linux kernel 5.4.106 including the latest security fixes.

General improvements
  • Full integration of the ACME protocol via the GUI: create valid and trusted certificates for domains with Let's Encrypt.
  • General certificate management via GUI: upload custom certificates from the web interface.
  • SpamAssassin 3.4.5 with support for external SpamAssassin update channels - Proxmox Mail Gateway will now fetch verified updates from external rule channels and the KAM ruleset channel is available.
  • Improved management of the Spam Quarantine: display the quarantined emails of all users at once in the admin view.
  • TLS-logging improvements: The Proxmox Message Tracking Center now shows when an outbound connection is established over TLS.
  • Enhancements to the integration of Proxmox Backup Server: getting notification emails if you have configured a Proxmox Backup Server Remote is now possible.
Countless bugfixes and other smaller improvements are included as well, see the full release notes.

Release notes

Alternate ISO download:


Community Forum

Source Code


Q: Can I upgrade Proxmox Mail Gateway 6.x to 6.4?
A: Yes, just via GUI or via CLI with apt update && apt dist-upgrade

Q: Can I install Proxmox Mail Gateway on top of Debian Buster?
A: Yes, see

Q: Can I install Proxmox Mail Gateway on Proxmox VE, VMware or Hyper-V as a virtual machine?
A: Yes, just do the ISO install. If you install on Hyper-V as a generation 2 virtual machine, please disable secure boot.

Q: Can I install Proxmox Mail Gateway as LXC container on Proxmox VE?
A: Yes, just download the proxmox-mailgateway template via the integrated template downloader.

A big THANK YOU to our active community for all your feedback, testing, bug reporting and patch submitting!

Best regards,

Martin Maurer
Proxmox Mail Gateway project leader
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