Exchange Server Client Throttling Policies

In order for the Email Signature Manager Service to function correctly on Exchange Server 2013 and higher, it is necessary to disable client throttling for the service account. This can be accomplished as follows:

1.Open the Exchange Management Shell and connect to Exchange Server.
 

2.Type the following command:
 
New-ThrottlingPolicy <Policy>
 
where <Policy> is a suitable, unique name for the policy (for example, ESMServiceAccountPolicy)
 

3.Type the following command:
 
Set-ThrottlingPolicy <Policy> -EwsCutoffBalance Unlimited -EwsMaxBurst Unlimited -EwsMaxConcurrency Unlimited -EwsMaxSubscriptions Unlimited -EwsRechargeRate Unlimited -IsServiceAccount:$true
 

4.Type the following command:
 
Set-ThrottlingPolicyAssociation -ThrottlingPolicy <Policy> -Identity <Account>
 
where <Policy> is the name of the policy and <Account> is the name of the service account to which the policy will be assigned.

Note Changes to client throttling policies will not be applied immediately on your Exchange Server; please allow some time for the changes to become effective.