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Hard bounce: O365 Delivery Failure messages

Question asked by user.EM1kBzh26AGN on Aug 7, 2016
Latest reply on Dec 7, 2016 by user.8DEiBx3wZo


I'm new to Mimecast have a problem about the Delivery Failure message from Blackberry and Office 365. I noted some message from are rejected "5.7.512 Access denied, message must be RFC 5322 section 3.6.2 compliant and include a valid From address" How I add exception for Office 365 so we can receive our delivery failure message. Or is it possible we have  something wrong in setting?