how to add the list-unsubscribe header to all outgoing emails using proxmox?

Probably can be done with a 'Modify Field' action - Field 'List-Unsubscribe' Value: the address you want to set the header to
 
check the reference documentation on the subject:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#chapter_mailfilter

very shortly:
* In the GUI (Section Mail Filter)
* create on Action Object -> Modify Field -> enter 'List-Unsubscribe' as Field and the address you want in the list-unsubscribe header as Value
* create a Rule and add this Action
* every mail will get the header set.
 
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Reactions: mihaii8
Hello, I am trying to perform the same procedure, but I do not see that option: Action Object -> Modify Field.
please see the image attached.
Can you help me please?
 

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