But there's a happy medium if you'd like more control. You can host your own email app, and then use a transactional email sending service—including Amazon SES, Mailchimp's Mandrill, SendGrid, and Mailgun—to send your messages. That gives you the flexibility of an app that you control, the cost savings of bulk email sending, and the confidence of sending emails with a dedicated service that delivers your messages to any email app, anywhere.
One of the easiest ways to manipulate data is by throwing it into a spreadsheet. Almost anyone can then easily sort the data and quickly find similar segments. Vision6 lets you do this with your contacts, with a spreadsheet-like interface to filter your contacts. Instead of having to set filters and hope they pick the right people, you can see every field in your contact details, sort by the item you want, then select contacts and turn them into a new segment in seconds.