The default maximum message size limit that can be sent and received by email in cPanel is usually 50 MB.

If you need to change it:

  • Login to WHM as root
  • Under Service Configuration, click “exim Configuration Manager
  • Click “Advanced Editor
  • Scroll down and Click “Add additional Configuration Setting
  • Find “message_size_limit” in pull-down list and choose
  • Enter the value that you want to set as limit
  • Scroll to bottom and click “save

NOTE: 50 MB is a quite large limit; many email operators have much lower limits (as 25 or even 10 MB)
So, even if you set a larger limit, this does not mean that your users will be able to successfull send messages with very large attachments: even if you have set a 100 MB limit, but your user send a message to a server which has a 10 MB limit, that message will not be received.

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  • WHM, Exim
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