How to use an email list built from a business for another similar project ?

Hello everyone !
We had a business running well in the past year ! It's a monthly subscription service ! That's how we collected the emails of our clients ! we were doing very well but due to some law issues we had to shut down the service ! Now we're willing to do a similar job for another project but this time we'll be avoiding the thricky part to build a 100% whitehat Service ! is there a way to promote our new service without mentioning anything about the previous Service…

How to use an email list built from a business for another similar project ?