How to increase the maximum message size of messages within Exim.

Introduction

By default, the largest message that Exim can send is 50 MB. This article provides the steps to increase that size.

Procedure

1. Log into WHM as the ‘root’ user.
2. Navigate to "Home / Service Configuration / Exim Configuration Manager."
3. Click the "Advanced Editor" tab.
4. Scroll down to the "Add additional configuration setting" button.
5. Click the "Add additional configuration setting" button.
6. Select "message_size_limit" from the new dropdown menu.
7. Enter the desired value in the "message_size_limit" textbox.
   Please note that the value must be in kilobytes (K) or megabytes (M).
8. Scroll to the bottom of the page.
9. Click the "Save" button.

Please note that 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.

Additional resources

Exim Configuration Manager

How to increase the maximum allowed attachment size in Webmail