Recipient limit for an individual Office 365 user when in a hybrid scenario

exchangeexchange-2010microsoft-office-365

We have a office 365 hybrid set-up with an Ex 2010 SP3 environment.
All traffic is routed through the on-premise exchange.

One user, whose mailbox is hosted on 365, wants to mail ~300 people at once.
Their 365 mailbox is configured to allow 500 recipients however when the user
sends to 300 recipients, he receives a bounce back from the on premise server stating that the limit is set to 30.
This is true as our default is set to 30 in the transport settings of the exchange server, however we don't want this to be increased across the board.

Is there any way we can allow this one user to be send to 300 recipients through our exchange server without increasing the default for all users?

Thanks

Best Answer

You might wish to come up with a new Client Throttling Policy for that special user and then inside that Client Throttling Policy adjust the values for (see here):

The RecipientRateLimit parameter specifies the limits on the number of recipients that a user can address in a 24-hour period.

and if needed:

The MessageRateLimit parameter specifies the number of messages per minute that can be submitted to transport by POP3 or IMAP4 clients that use SMTP. Clients receive a transient error if they submit messages at a rate that exceeds the value of this parameter. Exchange attempts to connect and send the messages at a later time.

Related Topic