You would like a history recorded when faxing via FaxBlast and WinFax Pro.
At this time, the histories for Fax Blast are disabled due to a problem that occurs with a very long lag time occurring when writing the history item.
If you still have your lookup created for the fax blast, you can create a mass history entry by going to CONTACT > RECORD HISTORY. From this window you will push the button that says "Contacts...". You can choose "Select From" and choose "Currently Lookup". Then press the double arrows (>>) pointing to the right to add the lookup to the list. From this window you can also add attachments and in this case the document you were Fax Blasting.