Sometimes you'll want to alter the message count limits for sending and receiving in Exchange. Here's the commands you will need:
For organization
Set-TransportConfig -MaxRecipientEnvelopeLimit 1000
Get-transportconfig |fl name,MaxRecipientEnvelopeLimit (=250)
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For transport server
Set-TransportServer -Identity "Server01" -PickupDirectoryMaxRecipientsPerMessage 200
Get-TransportServer |FL PickupDirectoryMaxRecipientsPerMessage,name (=100)
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For recieveconnector
Set-ReceiveConnector -Identity "Contoso Receive Connector" -MaxRecipientsPerMessage 300
Get-receiveconnector |fl name,MaxRecipientsPerMessage
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For mailbox:
Get-mailbox |fl name, RecipientLimits
(All seem to unlimited)