Once an email message has been added to a record, any related emails are automatically attached to the same record as well as to any recipients of the original email. Each message has a Remove link. If the role has a full level permission on Track Messages, then the remove field becomes available. To disable the field for the custom role, perform the following steps:
1. Login as Administrator. 2. Navigate to Setup > Users/Roles > Manage Roles. 3. Edit the role. 4. In the Permissions tab > Lists subtab, locate Track Messages permission. 5. Select a lower level (e.g. Edit, View or Create). 6. Click Save.