Mailbird is a very interesting email client. Simple, convenient and with a set of all necessary functions. It was created after the closure of the Sparrow project and partly copies its simple interface. The goal of the project: creation and further development of a fast email client with an accessible interface. In functional terms, this is a simple but fully functional mail client: support for working with multiple mail accounts (up to 100 accounts, you can specify a well-known service or a POP3 / IMAP server of the mail provider), search for letters and attachments, a letter reminder system (Snooze, like in GMail), new mail notifications, and so on. Mailbird has a feature – a special function “Applications”, which, in fact, is a set of ordinary Internet service sites, which open in the program window for convenient interaction with the mail client. So there are several applications from the developer that add additional functionality to the program (for example, a contact manager or search by attachments).