Mail user agent with POP, IMAP, mh support using Tk

 TkRat is a graphical Mail User Agent (MUA) which handles MIME. It is
 mainly written in C but the user interface is done in tcl/tk.
 .
 The program currently understands unix mailboxes, POP, IMAP and mh
 folders. It can manage a database of messages associated to events
 triggered by elapsing time intervals. Messages are sent via SMTP or
 any user configured program (for example sendmail).