The best thing about iPostaldigital is its flexibility of using it with other apps that have similar functions like e-mail marketing tools which helps us work faster at times when we’re doing multiple tasks simultaneously (like sending out mass emails using Aweber). Also I enjoy how fast my inbox gets cleared up each morning! Sometimes certain features are difficult for me use such as creating new templates but nothing major since there's always an easier way around things sometimes once you know what your looking for -.- so not really anything too negative here unless perhaps they change something in terms of price point/features. Be sure to do plenty testing before implementing everything, also keep track if any glitches occur during initial implementation because these will be fixed pretty easily usually within 24 hours depending upon severity level etc. Tracking shipping costs via carrier tracking number provided through USPS. I like that you can get all your mail in one place! You can also search by address which is very helpful when trying to find items with no street number or an incorrect mailing address. Sometimes it takes awhile for new messages to show up after they are sent. The app does not always update immediately so if you send something at 11 am only then will appear on the website until 2 pm. It's great because everything is together and easy to look through.