The Contacts tab displays the Contacts held for that client in your practice management software.
If you have Include Client's Contacts set "On" in your practice's Email AutoFile Settings, AutoFile searches the Client's Contacts to find a match for the Client Name. If an email is sent to or received from the email address of one of the Contacts that is held for a client in your practice management software, this will match on the client when an email is autofiled. This allows emails to be filed to the client when they are sent or received to/from internal team members, bookkeepers, advisers, etc. Refer to Email AutoFile Settings, Exclusions and Practice Filing Defaults.