MIAB is failing DMARC for sub-domain mail

[alento]

For what it’s worth:

DMARC Fail but mail ends up in Inbox

I was testing the filtering policies of MIAB by sending mail through my ISP’s email server with a From: and Envelope Sender address in my domain. The mail ended up in my Inbox despite being marked correctly with a DMARC fail. Authentication-Results: box.timothydutton.co.uk; dmarc=fail header.from=timothydutton.co.uk Admittedly the From: and the To: addresses were both for the actual email address for the account. e.g. mail from: <joebloggs@timothydutton.co.uk> rcpt to: <joebloggs@timothydut…