At times, automated emails that are generated from the events system or scheduled email reports within SmarterMail may not reach the Exchange server they are sent to. This is because the From field in the email is empty and Exchange 2013 denies any email without the sender information in the header.
A workaround within Exchange to accept email from null senders resolves this issue. In short, you'll want to open an Exchange Shell and modify the following line from true to false:
Set-SenderFilterConfig -BlankSenderBlockingEnabled $false
More information on this workaround can be found in the following Exchange help docs:
