Hi All, For awhile now, we (Groups.io) have been trying to track down an issue where some email services have been rejecting some group emails from us, because of DMARC errors, even though we were re-writing the From lines with our own domain. It was driving me a bit batty.
It turns out that Exim, before it was fixed in version 4.98, would include any Resent-From header line in DMARC checking. And that was causing the DMARC error, because we include that header, with the original From address. Something to check for if you see unexpected DMARC rejections and when your emails include Resent-From lines. Cheers, Mark
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