check before: 2021-05-31
Exchange, Microsoft 365 admin center
Online, World tenant
As announced in MC239262 and on https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-mailbox-receiving-limits-hot-recipients/ba-p/2155862 target="_blank" style="background-color: white; font-family: sans-serif; font-weight: 400;">this blog post, Exchange Online is starting to enforce our published mailbox receiving rate limit, incrementally lowering the threshold until reaching the documented limit of 3600 messages per rolling hour. We?ve detected that some tenants have configured their https://docs.microsoft.com/en-us/exchange/security-and-compliance/journaling/journaling#alternate-journaling-mailbox alternate journaling mailbox to point to an address hosted in Exchange Online, which as described in the https://docs.microsoft.com/en-us/exchange/security-and-compliance/journaling/configure-journaling#specify-an-alternate-journaling-mailbox-for-undeliverable-journal-reports configuration documentation is an unsupported configuration and due to the new enforcement of limits may cause throttling on alternate Journal mailbox and loss of the Journal Report NDR emails. Note: If your organization is not using Exchange Online's journaling functionality you can safely disregard this message.As a reminder, Microsoft?s best practice to meet your email compliance and regulatory needs is to leverage our https://docs.microsoft.com/en-us/microsoft-365/compliance/?view=o365-worldwide target="_blank" style="background-color: white; font-family: sans-serif; font-weight: 400;">Microsoft 365 Compliance suite of solutions rather than journaling messages to another location.
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