All forum generated e-mails get errors when trying to forward them to iCloud mail box.
Completed
This started a few days ago and now happens for every e-mail notification from these forums when the e-mails are forwarded from GMail to my iCloud e-mail:
550 5.7.1 Your message was rejected due to the sending domain's DMARC policy. See https://support.apple.com/en-us/HT204137 for info.
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Thanks for reporting, forwarded.
We've reported this issue to Zendesk support and will update you on their reply. Thanks!
Thank you.
This appears to have been recently fixed. For the past week all forum e-mails make it into my inbox.