The issue appears to be completely intermittent. Some emails get through, some dont. The disappearing messages contain attachments at times, and no attachment other times. It appears that 'most of the time' the messages ARE received. The fact that no NDR is received by sender makes it impossible for either party to know the email didn't go through. This is causing a huge communication bottleneck during important projects.
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In this video we show how to create a Contact in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Recipients >> Contact ta…