Hey there! I used to sell a command-line email utility that I had written for 32-bit implementations of Microsoft Windows. The utility was named MailSend ( not to be confused with the three or four other command-line mailers which share the name. ) MailSend was the first of my independent application to achieve widespread use. Although it’s no longer something that I sell, I wanted to document the experience of developing and selling MailSend and other applications from my point of view for historical purposes.