In a hybrid Exchange environment, emails from your Microsoft 365 tenant to your Exchange on-premises servers are sent using connectors. In most cases, there won't be any data in this report, as there may be no mailbox near the email receiving limit. The report is also available in tabular format, displaying the hours a mailbox exceeded the limits or was at risk, top email sender, proportion of spam emails, and emails received per hour. The consequence of crossing the threshold is that the mailbox won't be able to receive emails for at least an hour. "At risk" implies that the mailbox has received huge volumes of emails and is about to hit the throttling limit. "Exceeded" status in the report means that the mailbox has hit the maximum receiving limit. Hence, this can serve as the first step for you to identify the load of TLS 1.0 or 1.1, which will be deprecated.Įxample of mailboxes exceeding receiving limits report with the heatmaps It divides the emails according to how they were received: from the internet or from your on-premises servers (in hybrid Exchange) they are further categorized according to the TLS version used. The Inbound messages report displays the number of emails received by your tenant. Note that this is applicable to the new Microsoft 365 Admin portal only. These reports can be found at this path: Exchange Admin Center > Reports > Mail Flow. Let's explore the ones available in the Exchange Admin Center.
Mail flow reports are available in multiple locations. Locating the Mailflow report in the Exchange Admin Center
Security Administrator (assigned from the Azure portal).The following roles are required to view the reports in the Exchange Admin Center (EAC):
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