You do not need to have multiple lists. If you want to have one list for people interested in technology and one list for people interested in finance, you can separate those people by using categories.
To set up a category, go to ‘List,’ then click on ‘Categorize List.’ With the above example, you would type in ‘What is your primary field of interest?’ in the Category 1 bar, then below it include ‘Technology’ and ‘Finance’ as options.
To send a campaign to a specific category, create your campaign and follow the steps through to Step 4, ‘Target Your List.’ Once on this step, simply select the category you’re sending the campaign to, then click ‘Next.’
If you publish or manage different email lists for multiple clients, simply set up one account per client.