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Postmark: How email forwarding can break DMARC
Postmark just issued a new insightful blog:
You’ve got a list of all the sources you’re sending from, and you’ve made sure they are all set up with DKIM and SPF. So why aren’t you seeing 100% alignment when your DMARC report comes through? Here is how you might first spot the problem. In this screenshot from DMARC Digests, the ‘Health’ section gives you a quick overview of how each sending source has been categorised: a green tick is a known source, a green arrow pointing towards the right is a forward, and a red x is unknown. As a sender, you can be pretty sure you set everything up correctly, but then your report shows that SPF didn’t pass and the Return-Path header domain doesn’t match the From domain. The likely culprit here is forwarding. …are you ready to go down this rabbit hole with us? How forwarding affects DKIM and SPF Emails are forwarded all the time, and when
Read more from the original source: How email forwarding can break DMARC
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