Increase Message Size Limits in Exchange 2013

Message size limits are an important mechanism to control mailbox sizes. One commonly asked question is about message size limits. There are basically three places where you can configure default message size limits on Exchange:

  • Organization transport settings

  • Send and receive connector settings

  • User mailbox settings


The example below shows how to increase the size of messages accepted by the transport service to 35MB:

To set message size limits on a mailbox to 20MB:


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About Nicolas 254 Articles
I work as a System Engineer, based in Switzerland with a primary focus on Microsoft technologies. I have 8 years experience in administering Windows Servers. . I am a Microsoft MVP for Cloud & Datacenter Management. I also received the PowerShell Hero 2016 award by PowerShell.0rg. And finally, I am "MCSE: Cloud Platform and Infrastructure", "MCSA: Windows Servers", "Administering & Deploying SCCM", and CheckPoint CCSA certified.