This is one of the best apps I've used for managing my business mailing list. It's easy to keep up with addresses. The design is great, and we love having it in-house. There are some aspects that still could be improved - e.g., being able to separate large numbers of addresses by ZIP code would make it more accurate - but it is very useful for us. And if it gets out of synch with our other email/contacts/etc. systems, there are options to sync back quickly using Dropbox or Google Drive. We needed a replacement for an outdated software program at work, and this is working well so far. Easily accessible, and makes keeping track extremely easy. Tracking expenses and mileage reimbursements is helpful. It was so easy for me to set up my business with this service! There is no risk involved. Their support team gets back to you right away when you have questions. I cannot think of anything that could be improved about this software! This program is perfect for any small-medium sized businesses or sole proprietor who needs help managing their mailbox. Mail comes straight into an email account instead of having to walk across town to pick it up (which would cost more).