Hi,

We have a test throttling policy to restrict a mailbox to send at most 2 messages per minute in our live Exchange 2013 CU6 enviroment. It was associated to a test mailbox. We have separated installed 2 mailboxe and 2 cas server roles in our enviroment. I have checked latest CU-s (7 & 8) but these are not fixing any related bugs.

We tried lots of workaround (see below list) and solutions to fix this but it is still not working with outlook MAPI and OWA client.

• Throttling policy not working
• smtp service restart
• RPC Client Acces service restart

The policy details:

Get-ThrottlingPolicy  low_rate_limit |fl *limit*

MessageRateLimit   : 2
RecipientRateLimit : 1000

Get-mailbox testuser@contoso.com | fl ThrottlingPolicy

ThrottlingPolicy           : low_rate_limit

Do you have any idea what is the problem?

Thank you in advance.

br,

Zoltan

Hi Zoltan,

Base on my research, you need to configure the MessageRateLimit parameter on receive connector also.

The MessageRateLimit parameter specifies the maximum number of messages that can be sent by a single client IP address per minute. The default value for a Receive connector configured in the Transport service on a Mailbox server is unlimited. The default value for a Receive connector configured on an Edge server is 600 messages per minute. The valid input range for this parameter is 1 to 2147483647. To remove the message rate limit on a Receive connector, enter a value of unlimited.

https://technet.microsoft.com/en-us/library/bb125140(v=exchg.150).aspx

Best regards,