Hi,
I hope this finds you well; for the purpose, only software may not work. An email relaying option is required as well. I think as you are sending cold or unsolicited emails, the email relay would most preferably be set up on a privately held server. Mumara would be the choice of software that you'll be using to manage your campaigns-Schedule, Send and Track, while the back-end SMTP server will preferably be configured using market leader SMTP provider PowerMTA. We can help you configure the whole set up, being in the industry of high volume email infrastructure development for almost a decade. This would be your own set-up that ideally offers flexibility and freedom of sending cold emails.
Let's get it started, I look forward to hearing back from your side