MMC is a Mail Client, written in C++, for Gnome.

Current features (more to come in the nearest future):

 o Single window interface
 o Two pane view for multiple mailboxes
 o Sortable columnized email view
 o Simple Address Book
 o Complete support for POP3 email receiving
 o Complete support for SMTP email sending
 o Simple, organized email composition interface
 o Complete attachment support, intuitive attachment list
 o MIME support
 o Multiple recipients, carbon copy/blind carbon copy support
 o Multiple Mailboxes
 o Copying/Moving between multiple Folders


WWW: http://mmc.sourceforge.net/