So although the mail client says it was received by @icloud.com. When inspecting all the headers, I do notice my email popping up in there under Received:
fields (I’m not posting the details for privacy reasons).
I’m not sure why my email client shows me a weird receiver email. But at least now I know what address is getting spammed!
Cheers!
came here looking for this exact comment. Agree with all point (last one most importantly).
Firefox team should look at what Arc browser is doing.