The conditions that cause documents to be classified as internal are : 

1. Where the email domain is listed under Processing > Settings > Define Active Directory parameters and specify internal domains > Internal domains.
   
   
    
2. Where the message does not have a fully qualified email address showing in the participant's address.

The conditions that cause participants to be classified as external are : 

1. Where the participant has a fully qualified email address and the domain is not listed under Processing > Settings > Define Active Directory parameters and specify internal domains > Internal domains.

It is not possible to change the classification of a message after processing of the data has been completed.