But yet years later and no change.

Its simple, in the subject line of an e-mail that is delivering an invoice we would like the 'Job Name' , and perhaps the 'Company Name' ,to automatically populate the e-mail subject line. One might imagine the subject line to be edited something like this: "Invoice <num> for the <project name> from <company name>

If you send a lot of invoices for a number of projects, you have to do a lot of cutting and pasting in order to come off like a company that looks like something. People have been asking for this option for years, and the answers you give are complete BS - "use a PO number instead" of a job name - really???