Claws Mail is developed since 2001 and allows to add multiple email accounts in its interface and manage them easily.
Supports all popular protocols such as SMTP, POP3, IMAP; it displays emails in a threaded view, users can mark messages with different colors to identify them easily later on.
Can search through messages, allows to set filters for incoming emails, includes a spell checker, allows drag and drop, theme change and more.
Plugins are available to be installed in order to modify default functionality.
