The email marketing contact list can be sorted by a decent amount of fields but one that is missing is being able to sort by Business Name. From there you can create a specific email list for businesses separate from basic end-user customers.
Also, with some investigation, I noticed that the contact list does not have a place for a Business Name. Why would this be excluded? I've imported thousands of contacts and not one has the Business Name that was associated with it when I chose that specific field to import.
I really liked that SE has this email marketing feature but I might have to stick with MailChimp if this cannot be corrected.