Load balancing: Only provide web interface on one node and email notification

[workpush]

Hello!
In the documentation it is said (https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#_load_balancing):

The second node can then be used as a quarantine host, that only provides the web interface to the user quarantine.

1. But I did not find a chapter, how to configure that - so can you tell me, how to configure the web interface to be just reachable for one node?

2. Which email is taken then to inform the user about new quarantine mails?
I currently get something like postmaster@pmg-03.server.XXX.de. The mails are also not DKIM signed. Can I change this for a cluster? And change the mail per relay-domain?

Thank you!!

 

[Stoiko Ivanov]

1. But I did not find a chapter, how to configure that - so can you tell me, how to configure the web interface to be just reachable for one node?

a) GUI->Configuration->Spam Detector->Quarantine (the quarantine host and port settings) - these a basically used to construct the links for the spamreport (and the quarantine is only accessible on the master node)
b) you can configure a nginx-proxy for quarantine access - see:
https://pmg.proxmox.com/wiki/index.php/Quarantine_Web_Interface_Via_Nginx_Proxy
and also check out the getting started page:
https://pmg.proxmox.com/wiki/index.php/Getting_started_with_Proxmox_Mail_Gateway
(with all linked pages)

2. Which email is taken then to inform the user about new quarantine mails?
I currently get something like postmaster@pmg-03.server.XXX.de. The mails are also not DKIM signed. Can I change this for a cluster? And change the mail per relay-domain?

the from header is fixed for the reports - and the envelopesender is kept empty (to prevent bounces for reports)
see https://bugzilla.proxmox.com/show_bug.cgi?id=2971 for why dkim signing is not (yet) possible for those mails