Exchange attachment size limit – where to find it

To check your server’s current limit you can open and access them via Exchange Management Console (EMC), however PowerShell offers a faster method that is available also on Office 365. Run the following code in the Exchange Management Shell, or after connecting with Office 365 via remote PowerShell session:

get-transportconfig | ft maxsendsize, maxreceivesize 
get-receiveconnector | ft name, maxmessagesize 
get-sendconnector | ft name, maxmessagesize 
get-mailbox Administrator |ft Name, Maxsendsize, maxreceivesize