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...ate him. I can safely drop this message". > Is that about right? barclays.com has a DNS record setup that says all mail from this domain should be authenticated, the "p=reject" in here: $ dig _dmarc.barclays.com txt +short "v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua at emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf at emaildefense.proofpoint.com" This auth can either be by IP address of sending server (SPF) which is not going to work for mailing list messages, or by valid DKIM signature. The mail admins can choose what is covered by the DKIM signature. In the case o...

I don't know enough about DMARC to make any sense of what you just said... actually wait, maybe I get it. You're saying that email sent that I send to the list will land in your inbox with my address in the From header. But the recipient mail system will think to itself "this message couldn't possibly have come from Mark, because a cursory inspection of the routing history clearly