Exchange Transport Config Maximum message size, Max send receive size | Get commands for to view Message size in send and receive connectors

 Get-

get-transportconfig | ft maxsendsize, maxreceivesize 

get-receiveconnector | ft name, maxmessagesize 

get-sendconnector | ft name, maxmessagesize 

get-mailbox Administrator |ft Name, Maxsendsize, maxreceivesize

Set-

Set-TransportConfig -MaxSendSize 130MB -MaxReceiveSize 30MB

Get-Mailbox | Set-Mailbox -MaxSendSize 30MB -MaxReceiveSize 30MB

Get & Set

get-transportconfig | Set-TransportConfig -maxsendsize 30MB -maxreceivesize 30MB; get-receiveconnector | set-receiveconnector -maxmessagesize 30MB; get-sendconnector | set-sendconnector -maxmessagesize 30MB; get-mailbox | Set-Mailbox -Maxsendsize 30MB -maxreceivesize 30MB

Restart-Service MSExchangeTransport