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To avoid this issue with the rate limit, forwarding should be set up at the mailbox level via Tufts Tools. Users can change their forwarding settings at

Removing Rate Limit (Exchange On Prem Only)

To remove the limit, you have to remove the max recipient limit from Exchange Management Console, and then run a command in the shell to put the mailbox in a different policy. This can be done in any order.

Exchange Management Console:

Open up Mailbox Properties in Exchange.

Select Mail Flow Settings tab.

Delivery Options → Properties

Remove check for Maximum Recipients.

Exchange Shell:

Set-Mailbox -Identity UTLN -ThrottlingPolicy HighVolumePolicy