There are no longer any emails in the quarantine ( I checked from before the date that proxmox was started/license bought ) for the user involved.
The links to a (black listed) email does still get me to the (empty) Quarantine Page.
The link "web interface" at the bottom of the page user still works as well.
I tried this in a private browsing window to make sure the cookies in my webrowser for me as an admin are not interfering with what I see.
As I understand it the "Lifetime (days) entry" determines the length of time something stays in the quarantine (so the emails there don't take too much space). That is not what I want to change.
I want to make sure someone getting her/his hands on a, say 3 months old, Spam Report email from a stolen laptop, cannot use any of those links to get to the white and blacklist information. In other applications I have the creation date in plaintext in the URL, but there is a hash attached to the URL information that makes tampering with the date result in an invalid URL. The URL is only valid 48 hours.