EvolutionEvolution is an open source flexible and fully featured email client. It is easy to connect with Microsoft Exchange servers with Evolution email client. It has the feature to filters spam mails using Spam Assassin. It supports S/MIME for secure messaging.
It can support multiple accounts. This client offers email, contacts, LDAP compatibility etc and much more. Evolution supports the "iCalendar" file format. It's a Graphic User Interface platform. Evolution supports protocol such as IMAP, LDAP, NNTP, POP3 and SMTP etc. Evolution is only available for Linux.