Maximum concurrent connections per domain: The maximum number of outbound connections that the Transport service can have open to a single domain at a time. Note: In the EAC, you can only set the values 100, 1000, 5000, or unlimited. Servers > Servers > Properties > Transport limits section > Maximum concurrent connections. This value must be greater than or equal to the MaxPerDomainOutboundConnections value. Maximum concurrent connections: The maximum number of outbound connections that the Transport service can have open at a time. Maximum connection rate per minute: The maximum rate that connections are allowed to be opened with the Transport service. Parameter: MaxConcurrentMailboxSubmissions Maximum concurrent mailbox submissions: The maximum number of submission threads that the Transport service and the Mailbox Transport Submission service can have open at the same time to send messages from mailboxes.Ĭmdlet: Set-TransportService and Set-MailboxTransportService We recommend that you don't modify this value unless you're directed to do so by Microsoft Customer Service and Support.Ĭmdlet: Set-TransportService and Set-MailboxTransportService p> Parameter: MaxConcurrentMailboxDeliveries Maximum concurrent mailbox deliveries: The maximum number of delivery threads that the Transport service and the Mailbox Transport Delivery service can have open at the same time to deliver message to mailboxes. The following table shows the message throttling options that are available on Mailbox servers and Edge Transport servers. Collectively, we'll refer to these as transport servers.
There are also static limits that are available on messages, such as the maximum message size, the size of individual attachments, and the number of recipients. For more information, see Understanding back pressure.
Key resources, such as available hard disk space and memory utilization are monitored, and when the utilization level exceeds the specified threshold, the server gradually stops accepting new connections and messages.
Back pressure is another feature that helps to avoid overwhelming the system resources of an Exchange server.
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