Get command Microsoft Exchange server 2010

To view organization-wide e-mail transport 
Get-TransportConfig

To Set organization Limits
Set-TransportConfig -MaxSendSize 20MB -MaxReceiveSize 20MB -MaxRecipientEnvelopeLimit 300

To view the configuration information for a Send connector on a computer that has the Hub Transport server 
Get-SendConnector

Send Connectors 
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

To view the configuration information for Receive Connectors
Get-ReceiveConnector

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