MailSurgeon core feature, the 'Query Editor', lets you build mailing lists straight from your application database.
This tool was designed for marketing managers, to set him free from programmers assistance, free from all the hard work involving import-export excel list from one system to another, and free from segmentation limitation.
Creating segments straight from your database can be tricky if you don't know your database so well.
But if your database administrator can give you a hand, you'd be surprised how easy segmentation can be. A handy convincing tip you might want to use:
The following video explains how to make your segmentation efficient: