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It does not work on mails from mailman delivered by smtpdirect.
Ubuntu 20.04, Mailman 2.1.29, last Plesk updated installed.
ARC somehow works when a mail address has Forwarding switched on. The forwarding mail is ARC signed.
Any chance to get this working also for mailman?
Yes, the mail_arc_sign thingy I also found and it works - but not yet with mailing lists.
If forwarding for a mail address is switched on then an ARC header is being added to the forwarding mail.
But for mailing lists this is not yet recognized as a forward.