Problem

When using Microsoft Outlook, you receive a bounce back message that says Message has lines too long for transport.

Cause

This error is caused because Outlook adds a lot of HTML to email messages and does not properly wrap long lines. This is a known issue with cPanel and they are aware of the problem and are working on a fix. This issue only affects Microsoft Outlook users.

Workaround

Currently, there is no permanent fix in place, however there is a workaround available. Please be advised that this requires changing some settings in Microsoft Outlook.

Follow the steps below to implement this workaround:

1. Open Microsoft Outlook.
2. Select the File menu.
   
3. Select Options
   
   
4. Select the Mail options.
   
5. Scroll down to Message Format.
6. Adjust the value for "Automatically wrap text at character" and set this value between 65 and 70.
   
7. Select OK to apply the changes and close the options window.