How to get a history confirmation of sent faxes from my HP 640?
I have checked the FAQ page, but couldn't find anything related to Fax History. The available topics don't mention anything related to history. However, you have the possibility of downloading the Setup and User guide from the same page. You can find additional information in those documents.
Support page: http://support.hp.com/us-en/product/HP-640-Fax-series/3366988/model/3366989/manuals