Change the Maximum Message Size In OS X Mail Server

August 14th, 2013 by Charles Edge

The default size limit of new mail messages in OS X 10.8 Server is 10 MB. That’s small for many environments. To increase to 20 MB, open Terminal. Use serveradmin to increase the number, plugging it into mail:postfix:message_size_limit as follows:

serveradmin settings mail:postfix:message_size_limit = 20971520

To change it back, you would use:

serveradmin settings mail:postfix:message_size_limit = 10485760

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