#Get Organizational Limits
Get-TransportConfig

#Set Orhanizational Limits
Set-TransportConfig -MaxSendSize 20MB -MaxReceiveSize 20MB -MaxRecipientEnvelopeLimit 300

#List Send Connectors
get-sendconnector

#List Send Connectors with details (using Format-List/FL) 
Get-SendConnector | FL

#Set Send Connector Message Size Limit for a specific connector
Set-SendConnector -Identity "Default Internet Connector" -MaxMessageSize 20MB

#Set Send Connector Message Size Limit for all connectors
Get-SendConnector | Set-SendConnector -MaxMessageSize 20MB

#List Receive Connectors
Get-ReceiveConnector

#List MaxMessageSize for all Receive Connectors
Get-ReceiveConnector | FL MaxMessageSize

#Set MaxMessageSize for a specific receive connector
Set-ReceiveConnector -Identity "EX-2K7\Default EX-2K7" -MaxMessageSize 20MB

#Set MaxMessageSize for All Receive Connectors
Get-ReceiveConnector | Set-ReceiveConnector -MaxMessageSize 20MB

#Get MaxSendSize and MaxReceiveSize Mailbox Limits for a user
Get-Mailbox BAndersen | FL MaxSendSize,MaxReceiveSize

#Set MaxSendSize and MaxReceiveSize Mailbox Limits for a user
Set-Mailbox -Identity BAndersen -MaxSendSize 40MB -MaxReceiveSize 40MB