The following table shows the message throttling options that are available on Receive connectors. Receive connectors are available in the Front End Transport service on Mailbox servers, the Transport service on Mailbox servers, and on Edge Transport servers.
For more information, see Receive connectors. To see the values of these Receive connector message throttling settings, run the following command in the Exchange Management Shell:.
The Microsoft Exchange Throttling service tracks resource settings for specific uses and caches the information in memory. Mail flow throttling settings are also known as a budget. Restarting the Microsoft Exchange Throttling service resets the mail flow throttling budgets. Each mailbox has a ThrottlingPolicy setting. You can use the ThrottlingPolicy parameter on the Set-Mailbox cmdlet to configure a throttling policy for a mailbox.
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Internet of Things IoT. Enabling Remote Work. Small and Medium Business. Humans of IT. Green Tech. MVP Award Program. Video Hub Azure. The following tables show the message limits at the Organization, Connector, Server, and Mailbox levels, including information about how to configure the limits in the Exchange admin center EAC or the Exchange Management Shell.
Organizational limits apply to all Exchange servers, Exchange servers, Exchange Mailbox servers, and Exchange Hub Transport servers that exist in your organization. On Edge Transport servers, any organizational limits that you configure are applied to the local server. Organizational limits also apply to external senders and external recipients anonymous or unauthenticated senders or recipients :.
For inbound messages from external senders, Exchange applies the organizational maximum send message size limit the maximum receive message size limit as described in the Recipient limits section is applied to the internal recipient. For outbound messages to external recipients, Exchange applies the organization maximum receive message size limit the maximum send message size limit as described in the Recipient limits section is applied to the internal sender.
Therefore, a message size must be within the message size limits for both the sender and the recipient. This concept is also explained in the Order of precedence and placement of message size limits section later in this topic. To see the values of these organizational limits, run the following commands in the Exchange Management Shell:. Connector limits apply to any messages that use the specified Send connector, Receive connector, Delivery Agent connector, or Foreign connector for message delivery.
You can assign specific message size limits to the Active Directory site links in your organization. The Transport service on Mailbox servers uses Active Directory sites, and the costs that are assigned to the Active Directory IP site links as one of the factors to determine the least-cost routing path between Exchange servers in the organization.
You can assign specific message size limits to the Delivery Agent connectors and Foreign connectors that are used to send non-SMTP messages in your organization. To see the values of these connector limits, run the following command in the Exchange Management Shell:. Server limits apply to specific Mailbox servers or Edge Transport servers. You can set these message size limits independently on each Mailbox server or Edge Transport server.
The pickup directory that's available on Edge Transport servers and Mailbox servers also has messages size limits that you can configure.
Typically, the pickup directory isn't used in everyday mail flow. It's is used by administrators for mail flow testing, or by applications that need to create and submit their own messages files.
Recipient limits apply to a specific user object, such as a mailbox, mail contact, mail user, distribution group, or a mail-enabled public folder.
To see the values of these limits, run the corresponding Get- cmdlet for the recipient type in the Exchange Management Shell. For example, to see the limits that are configured on a specific mailbox, run the following command:. The order of precedence for message size limits is the most restrictive limit is enforced.
The only question is where that limit is enforced. The goal is to reject messages that are too large as early in the transport pipeline as possible.
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