You can manage the list of emails in our Marketing tool and classify them based on location or demographic and send marketing emails based on your classifications. For e.g. you may have 10,000 emails of the potential customers who may be interested in your product A and another 50,000 emails of the potential customers who may be interested in your product. Now after creating the campaign you can select the target users and with just one click you can send emails to either of the two groups or to both of them.