Claws Mail is an email client program that has a large number of features but still manages to be very easy to use. A major selling point is that it's possible to add an unlimited number of email accounts, not always possible with other email clients. Claws Mail allows a large amount of configuration to be done to the interface meaning that it can be set up in numerous different ways according to preferences. Messages can be tagged, colour-coded and searched, and it has a very good spell-checker.