Exchange 2016 unable to upload large attachment

Brass Contributor

Whenever I try to upload attachment, it always prompt "The following files weren't attached because adding them would cause the message to exceed the maximum size limit of 25 MB:" 



I also set the maxsendsize and maxreceivesize to 100MB respectively but no luck though. Reset IIS and reboot the server and getting same result too. 




Anything I missing here and couldn't figure it out. 


Thank you all. 

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