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Set a Message Size Limit in WHM

  • Updated on Jul 13, 2026
  • Published on Feb 8, 2023
  • 1 minute(s) read
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Sometimes the default email message size with cPanel / WHM is not large enough and requires adjusting. Configuring this to a specific maximum size can be done as follows:

  1. Log into WHM.

    Login interface for WHM with fields for username and password entry.

  1. Under ' Service Configuration' , select ' Exim Configuration Manager' and go into the  ‘Advanced Editor’.

    Exim Configuration Manager interface showing configuration options and instructions for editing settings.

  1. Search for a large blue  'Add additional configuration setting ' button and click to select from a drop down list.

    Exim Configuration Manager interface displaying settings and options for email configuration.

  1. Select 'message_size_limit'.

    Exim Configuration Manager interface showing various message settings and options for configuration.

  1. Enter the desired limit for a message size (the default is 50 MB).

    Exim Configuration Manager interface showing message size limit settings and related options.

  1. To finish and save your changes, select 'Save'.

    Exim Configuration Manager interface showing retry settings and configuration options.

Note: If you do not also increase the maximum allowed attachment size in Webmail, you will still be unable to attach files larger than 50 MB in Webmail.