Importing Emails Lists + Subscribers

I've imported my subscribers from my previous ( no CS-Cart ) store but none of them appear to be in the mail list, I know it has an option for subscribe and unsubscribe keys but these are not mandatory. if they are needed to add to the mailing list whats the formula. I've 22,000 + subscribers so I can't do this manulally.



a sample of the file is below



Mailing list,E-mail,Language,Confirmed

1,megeanio@yahoo.com.au,en,1

1,rella69@gmail.com,en,1