Major features
* Threaded messages view.
* There is an "All Messages" screen which can list all messages, it is convenient to list by time series etc. across the folders.
* You can quickly access to accounts, folders and messages with the shuttle switch.
* You can create regular messages using blueprints. Since default values can be set for each folder, contents and signatures can be used properly.
* You can set rules and automatically assign them to folders.
* Gmail
About item purchase
* You can use all functions from the beginning, but there are limitations on the number of accounts, rules and blueprints that can be used by default. To use beyond the limit you will need to purchase items.