I need to send an email newsletter (HTML and text) to CFO's, but only have company name and location?

I have a list of 5000 companies, address, city and state. I want to send an HTML and text email to the CFO or VP Operations level contact at each company. Absent of looking up the specific executive via Hoovers or Selectory or some other way, then finding out the correct email convention for that company - is there an easier/faster process? The way I am used to doing it is OK for 10-20 companies, but no way for 5000. Any suggestions or actual guidance are welcome. It is important that the message gets to the CFO level, my company offers a very specific service.