I own a financial newsletter publishing company and years ago we paid about a million for our own email software. We have improved it a great deal would like to sell it to other companies but I know next to nothing about doing so. Any ideas? My IT guys are much too busy to try to sell it.
My advice is to download the community edition of MAUTIC, the open-source (i.e. essentially free) marketing-automation application that competes with commercial applications like Marketo, Eloqua, Pardot, etc).
If you discover that your email software has some significant technological advance over Mautic, then continue your search for answers.
If it does not, abandon the idea and go back to focussing on your core business.