![]() ![]() Maximum messages per connection: The maximum number of messages that can be sent over a single connection Rate limitĬonnection inactivity time out: The maximum amount of time that an open SMTP connection with a source messaging server can remain idle before the connection is closed.Ĭmdlet: New-SendConnector and Set-SendConnector For more information, see Send connectors. Send connectors exist in the Transport service on Mailbox servers and on Edge Transport servers. The following table shows the message throttling options that are available on Send connectors. Each directory can independently process message files at this rate. ![]() The maximum number of message files per minute that can be processed by the Pickup directory and the Replay directory is 100. For more information, see Configure the Pickup Directory and the Replay Directory. Typically, the Pickup directory and the Replay directory aren't used in everyday mail flow. The Pickup directory and the Replay directory that are available on Edge Transport servers and Mailbox servers also have messages rate limits that you can configure. To see the values of these server message throttling settings, run the following command in the Exchange Management Shell: Write-Host "Transport service:" -ForegroundColor yellow Get-TransportService | Format-List MaxConcurrent*,MaxConnection*,Max*OutboundConnections Write-Host "Mailbox Transport service:" -ForegroundColor yellow Get-MailboxTransportService | Format-List MaxConcurrent* Servers > Servers > Properties > Transport limits section > Maximum concurrent connections per domain. Parameter: MaxPerDomainOutboundConnections This value must be less than or equal to the MaxOutboundConnections value. 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.
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