When an Exchange organization is created, a default throttling policy is automatically created that implicitly governs all users within that organization. Although the default client throttling policy is generally sufficient to manage the load placed on your Exchange system, you can customize the default policy or add additional policies based on the needs of your organization.

If you’re hosting multiple tenants in your Exchange organization, you can define an acceptable load for each user of a tenant. Similarly, if you’re an on-premise organization, you can define an acceptable load on a user-by-user basis. Through policies, Exchange evaluates how each user uses the system and ensures that the resulting per-user load falls within acceptable boundaries as defined by the user’s policy. The client throttling system tracks system usage on a per-user basis and uses the throttling policy associated with that user to determine if throttling should occur.

So basically if you have multiple departments and you want to seggregate how many emails users in each department can send or how frequently they want to send it then Client Throttling policies can be created based on that,With Exchange 2010 we can limit the number of messages a user sends, using the RecipientRateLimit and MessageRateLimit parameters in a Throttling Policy.

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An automobile enthusiast at heart and computer geek by profession, started my Career with MS in 2005.Left Jobs and started Pledge Technologies (the parent company to Grishbi) back in 2009.We have been providing IT consulting to various Small and Medium businesses across US and UK since then.Our company specialises in Microsoft Server technologies like AD, Exchange, the rest and with numerous Office 365 migrations under our belt, we quite an expert with that too. Whatever we learn in our day to day life, we share it back on Grishbi as a Thank for all the love and support our customers have given us.