Hi
Excited that you have launched a new service. As this is a very limited scope, I would suggest for the first I help first
1. develop a competitor analysis of the either email marketing softwares in the market.
2. develop a unique positioning of your product and marketing strategy
A very popular way to market email marketing solution that has worked successful for brands like aweber, convertkit, active campaign, infusionsoft and more has been through developing an affiliate program.
Happy to have a chat and build your saas marketing game plan