It looks like Mimecast is breaking DKIM on outgoing email by modifying it in transit ("body hash did not verify"). What gives?
Mimecast and Outlook365 breaking DKIM on forwards is a known issue apparently? This makes DMARC nearly undeployable. https://www.mail-archive.com/search?l=mailop@mailop.org&q=subject:%22Re%5C%3A+%5C%5Bmailop%5C%5D+DKIM+issues+with+mails+from+outbound.protection.outlook.com%22&o=newest&f=1 …
6:30 AM - 16 Jun 2016
1 reply
3 retweets
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