Hey
I was just looking at the Google requirements.
Do we need to manually do anything in HubSpot in regard to this or is it inside the email code and handled by HubSpot itself:
ARC headers indicate that the message was forwarded and identify you as the forwarder. Mailing list senders should also add a ‘List-ID:’ header, which specifies the mailing list, to outgoing messages.
Many thanks