thanksProbably can be done with a 'Modify Field' action - Field 'List-Unsubscribe' Value: the address you want to set the header to
thanks, it workedcheck 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.
Thanks for your help, it worked perfectly.try Header Attribute