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Almost all of the spam I analyze has bad security records - ignoring anything with a bad / no DMARC would stop probably 80% of our spam problems.

The rest is a mix of no SPF/DKIM (I have no idea why that's even being accepted) and internal problems at the sender's computer. You're never going to fix PEBCAC.

Almost all of the spam I analyze has bad security records - ignoring anything with a bad / no DMARC would stop probably 80% of our spam problems. The rest is a mix of no SPF/DKIM (I have no idea why that's even being accepted) and internal problems at the sender's computer. You're never going to fix PEBCAC.

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I'd love to, but I don't have control of that portion of the email system here.

We get a lot of smaller vendors (and some large ones) that don't have their ducks in a row, and they get bounced. I don't understand what the email gateway is doing, because company A that we need to see (and doesn't have their DMARC set to reject or quarantine) gets rejected, but company B, with a bad envelope and no DMARC at all will go right through.